MIXED-SPECIES EXHIBITS WITH CARNIVORANS VI.
Mixed-species exhibits with Eared Seals (Otariidae), Walrus (Odobenidae) and Earless Seals (Phocidae)
Written by KRISZTIÁN SVÁBIK
Assistant Curator, Budapest Zoo and Botanical Garden, Hungary
Uploaded: 13th November 2018
Refreshed: 6th June 2020
INTRODUCTION
Within the narrower meaning of the mixed-species exhibits this document deals with 10 species of otariids, 9 species of phocids and the Walrus.
In the list below you can see which species have been kept in mixed exhibits in captivity:
Eared Seals, Otariidae
California Sea Lion, Zalophus californianus Lesson, 1828
South American Sea Lion, Otaria byronia de Blainville, 1820
Australian Sea Lion, Neophoca cinerea Péron, 1816
Steller Sea Lion, Eumetopias jubatus Schreber, 1776
Northern Fur Seal, Callorhinus ursinus Linnaeus, 1758
South American Fur Seal, Arctocephalus australis Zimmermann, 1783
Afro-Australian Fur Seal, Arctocephalus pusillus Schreber, 1775
New Zealand Fur Seal, Arctocephalus forsteri Lesson, 1828
Guadalupe Fur Seal, Arctocephalus townsendi Merriam, 1897
Subantarctic Fur Seal, Arctocephalus tropicalis J. E. Gray, 1872
Walrus, Odobenidae
Walrus, Odobenus rosmarus Linnaeus, 1758
Earless Seals, Phocidae
Northern Elephant Seal, Mirounga angustirostris Gill, 1866
Southern Elephant Seal, Mirounga leonina Linnaeus, 1758
Bearded Seal, Erignathus barbatus Erxleben, 1777
Grey Seal, Halichoerus grypus Fabricius, 1791
Harp Seal, Pagophilus groenlandicus Erxleben, 1777
Harbor Seal, Phoca vitulina Linnaeus, 1758
Spotted Seal, Phoca largha Pallas, 1811
Baikal Seal, Pusa sibirica Gmelin, 1788
Ringed Seal, Pusa hispida Schreber, 1775
„Temporary” combinations
Before discussing the main topic it is worth mentioning some „temporary” mixed exhibits which means that seals are often displayed with dolphins or with other animals mainly during demonstrations to the public. Some of the examples with California Sea Lions are listed below:
California Sea Lions (Zalophus californianus) and Common Bottlenose Dolphins (Tursiops truncatus)
Parc Astérix, Plailly, France
Photo © Parc Astérix
California Sea Lions (Zalophus californianus) and Common Bottlenose Dolphins (Tursiops truncatus)
Ocean Park Hong Kong, Aberdeen, Hong Kong
Photo © Simon Hampel
California Sea Lion (Zalophus californianus) and Rough-toothed Dolphin (Steno bredanensis)
Gulf World Marine Park, Panama City Beach, Florida, United States of America
Photo © Gulf World Marine Park
California Sea Lion (Zalophus californianus) and Walrus (Odobenus rosmarus)
SeaWorld San Diego, California, United States of America
Photo © Scott Richardson
California Sea Lion (Zalophus californianus) and Asian Small-clawed Otter (Aonyx cinerea)
SeaWorld San Diego, California, United States of America
Photo © www.familytravelsecrets.com
LIST OF SPECIES COMBINATIONS - OTARIIDAE
The list shows examples of species combinations with at least one species of otariids combined with the taxa below
California Sea Lion, Zalophus californianus (Photo © Krisztián Svábik)
West Indian Manatee, Trichechus manatus
Japanese Macaque, Macaca fuscata
Celebes Crested Macaque, Macaca nigra
Gelada, Theropithecus gelada
Capybara, Hydrochoerus hydrochaeris
South American Sea Lion, Otaria byronia
Steller Sea Lion, Eumetopias jubatus
Northern Fur Seal, Callorhinus ursinus
South American Fur Seal, Arctocephalus australis
Afro-Australian Fur Seal, Arctocephalus pusillus
Guadalupe Fur Seal, Arctocephalus townsendi
Walrus, Odobenus rosmarus
Northern Elephant Seal, Mirounga angustirostris
Southern Elephant Seal, Mirounga leonina
Grey Seal, Halichoerus grypus
Harbor Seal, Phoca vitulina
Spotted Seal, Phoca largha
Common Hippopotamus, Hippopotamus amphibius
Tucuxi, Sotalia fluviatilis
Common Bottlenose Dolphin, Tursiops truncatus
Black-footed Penguin, Spheniscus demersus
Great White Pelican, Pelecanus onocrotalus
Brown Pelican, Pelecanus occidentalis
Common Eider, Somateria mollissima
several waterfowl species
South American Sea Lion, Otaria byronia (Photo © Krisztián Svábik)
California Sea Lion, Zalophus californianus
Australian Sea Lion, Neophoca cinerea
Steller Sea Lion, Eumetopias jubatus
South American Fur Seal, Arctocephalus australis
Afro-Australian Fur Seal, Arctocephalus pusillus
Southern Elephant Seal, Mirounga leonina
Grey Seal, Halichoerus grypus
Harbor Seal, Phoca vitulina
Spotted Seal, Phoca largha
Australian Sea Lion, Neophoca cinerea (Photo © Brian M. Hunt)
South American Sea Lion, Otaria byronia
South American Fur Seal, Arctocephalus australis
Afro-Australian Fur Seal, Arctocephalus pusillus
New Zealand Fur Seal, Arctocephalus forsteri
Subantarctic Fur Seal, Arctocephalus tropicalis
Grey Seal, Halichoerus grypus
Harbor Seal, Phoca vitulina
Common Bottlenose Dolphin, Tursiops truncatus
Steller Sea Lion, Eumetopias jubatus (Photo © Krisztián Svábik)
California Sea Lion, Zalophus californianus
South American Sea Lion, Otaria byronia
Harbor Seal, Phoca vitulina
Spotted Seal, Phoca largha
Northern Fur Seal, Callorhinus ursinus (Photo © Glen Tepke)
California Sea Lion, Zalophus californianus
Afro-Australian Fur Seal, Arctocephalus pusillus
Walrus, Odobenus rosmarus
Grey Seal, Halichoerus grypus
Harbor Seal, Phoca vitulina
South American Fur Seal, Arctocephalus australis (Photo © Krisztián Svábik)
California Sea Lion, Zalophus californianus
South American Sea Lion, Otaria byronia
Australian Sea Lion, Neophoca cinerea
Walrus, Odobenus rosmarus
Harbor Seal, Phoca vitulina
Afro-Australian Fur Seal, Arctocephalus pusillus (Photo © Krisztián Svábik)
California Sea Lion, Zalophus californianus
South American Sea Lion, Otaria byronia
Australian Sea Lion, Neophoca cinerea
Northern Fur Seal, Callorhinus ursinus
New Zealand Fur Seal, Arctocephalus forsteri
Subantarctic Fur Seal, Arctocephalus tropicalis
Walrus, Odobenus rosmarus
Grey Seal, Halichoerus grypus
Harbor Seal, Phoca vitulina
Common Bottlenose Dolphin, Tursiops truncatus
Humboldt Penguin, Spheniscus humboldti
New Zealand Fur Seal, Arctocephalus forsteri (Photo © Arthur Chapman)
Australian Sea Lion, Neophoca cinerea
Afro-Australian Fur Seal, Arctocephalus pusillus
Subantarctic Fur Seal, Arctocephalus tropicalis
Guadalupe Fur Seal, Arctocephalus townsendi (Photo © Alexander Meyer)
California Sea Lion, Zalophus californianus
Harbor Seal, Phoca vitulina
Subantarctic Fur Seal, Arctocephalus tropicalis (Photo © Nicolas Servera)
Australian Sea Lion, Neophoca cinerea
Afro-Australian Fur Seal, Arctocephalus pusillus
New Zealand Fur Seal, Arctocephalus forsteri
LIST OF SPECIES COMBINATIONS - ODOBENIDAE
The list shows examples of species combinations with the walrus combined with the taxa below
Walrus, Odobenus rosmarus (Photo © Krisztián Svábik)
California Sea Lion, Zalophus californianus
Northern Fur Seal, Callorhinus ursinus
South American Fur Seal, Arctocephalus australis
Afro-Australian Fur Seal, Arctocephalus pusillus
Southern Elephant Seal, Mirounga leonina
Grey Seal, Halichoerus grypus
Harbor Seal, Phoca vitulina
Beluga, Delphinapterus leucas
LIST OF SPECIES COMBINATIONS - PHOCIDAE
The list shows examples of species combinations with at least one species of phocids combined with the taxa below
Northern Elephant Seal, Mirounga angustirostris (Photo © Mike Baird)
Celebes Crested Macaque, Macaca nigra
Gelada, Theropithecus gelada
Capybara, Hydrochoerus hydrochaeris
California Sea Lion, Zalophus californianus
Southern Elephant Seal, Mirounga leonina (Photo © Cláudio Dias Timm)
California Sea Lion, Zalophus californianus
South American Sea Lion, Otaria byronia
Walrus, Odobenus rosmarus
Harbor Seal, Phoca vitulina
Bearded Seal, Erignathus barbatus (Photo © Michael Haferkamp)
Harp Seal, Pagophilus groenlandicus
Ringed Seal, Pusa hispida
Grey Seal, Halichoerus grypus (Photo © Krisztián Svábik)
Arctic Fox, Alopex lagopus
California Sea Lion, Zalophus californianus
South American Sea Lion, Otaria byronia
Australian Sea Lion, Neophoca cinerea
Northern Fur Seal, Callorhinus ursinus
Afro-Australian Fur Seal, Arctocephalus pusillus
Walrus, Odobenus rosmarus
Harp Seal, Pagophilus groenlandicus
Harbor Seal, Phoca vitulina
North American River Otter, Lontra canadensis
Humboldt Penguin, Spheniscus humboldti
Brown Pelican, Pelecanus occidentalis
Harp Seal, Pagophilus groenlandicus (Photo © Virginia State Park)
Bearded Seal, Erignathus barbatus
Grey Seal, Halichoerus grypus
Harbor Seal, Phoca vitulina
Ringed Seal, Pusa hispida
Harbor Seal, Phoca vitulina (Photo © Krisztián Svábik)
California Sea Lion, Zalophus californianus
South American Sea Lion, Otaria byronia
Australian Sea Lion, Neophoca cinerea
Steller Sea Lion, Eumetopias jubatus
Northern Fur Seal, Callorhinus ursinus
South American Fur Seal, Arctocephalus australis
Afro-Australian Fur Seal, Arctocephalus pusillus
Guadalupe Fur Seal, Arctocephalus townsendi
Walrus, Odobenus rosmarus
Southern Elephant Seal, Mirounga leonina
Grey Seal, Halichoerus grypus
Harp Seal, Pagophilus groenlandicus
Arctic Fox, Alopex lagopus
Sea Otter, Enhydra lutris
Reindeer, Rangifer tarandus
Domestic Sheep, Ovis aries
Beluga, Delphinapterus leucas
Black-footed Penguin, Spheniscus demersus
Humboldt Penguin, Spheniscus humboldti
Brown Pelican, Pelecanus occidentalis
Great Cormorant, Phalacrocorax carbo
Flying Steamer Duck, Tachyeres patachonicus
White-tailed Sea-eagle, Haliaeetus albicilla
Spotted Seal, Phoca largha (Photo © David Fudan)
California Sea Lion, Zalophus californianus
South American Sea Lion, Otaria byronia
Steller Sea Lion, Eumetopias jubatus
Black-footed Penguin, Spheniscus demersus
Baikal Seal, Pusa sibirica (Photo © Sergey Gabdurakhmanov)
Black-footed Penguin, Spheniscus demersus
Ringed Seal, Pusa hispida (Photo © Jouni Koskela)
Bearded Seal, Erignathus barbatus
Harp Seal, Pagophilus groenlandicus
LIST OF MIXED-SPECIES EXHIBITS WITH LOCATIONS - OTARIIDAE
The list shows specific examples of mixed-species exhibits involving at least one species of otariids combined with the taxa below, with indication of the institution(s) where these have been tried out
California Sea Lion, Zalophus californianus
Combined species:
unknown institution
Combined species:
unknown institution
Combined species:
Institution(s): Los Angeles Zoo (California, United States of America)
Combined species:
Institution(s): Parque de la Naturaleza de Cabárceno (Obregón, Cantabria, Spain)
Combined species:
Institution(s): Jardim Zoológico de Lisboa (Portugal), Zoo Heidelberg (Germany)
Combined species:
Institution(s): Dalian Laohutan Ocean Park (China)
California Sea Lion (Zalophus californianus), South American Sea Lion (Otaria byronia), Steller Sea Lion (Eumetopias jubatus) and Spotted Seal (Phoca largha) mixed exhibit
Dalian Laohutan Ocean Park, China
Photo © Alex Kantorovich
Combined species:
Institution(s):Ocean Park Hong Kong (Aberdeen, Hong Kong)
Combined species:
unknown institution
Combined species:
Institution(s): Erlebnis – Zoo Hannover (Germany)
Combined species:
Institution(s): Moody Gardens (Galveston, Texas, United States of America)
Combined species:
Institution(s): WILDLANDS Adventure Zoo Emmen (the Netherlands), Zoo Dortmund (Germany), Kölner Zoo (Germany)
Female California Sea Lion (Zalophus californianus) and female South American Fur Seals (Arctocephalus australis)
WILDLANDS Adventure Zoo Emmen, the Netherlands
Photos © Krisztián Svábik
Combined species:
Institution(s): Faunia (Madrid, Spain), Zoologischer Garten Berlin (Germany)
Combined species:
Institution(s): Faunia (Madrid, Spain)
Combined species:
Institution(s): SeaWorld San Diego (California, United States of America)
Young California Sea Lion (Zalophus californianus) and Guadalupe Fur Seal (Arctocephalus townsendi)
SeaWorld San Diego, California, United States of America
Photo © www.zoochat.com
Combined species:
Institution(s): SeaWorld San Antonio (Texas, United States of America)
Combined species:
Institution(s): Wilhelma Zoologisch-Botanischer Garten Suttgart (Germany)
Combined species:
Institution(s): Erlebnis – Zoo Hannover (Germany)
Combined species:
Institution(s): Louisville Zoo (Kentucky, United States of America), Marineland (Antibes, France)
California Sea Lions (Zalophus californianus) and Grey Seal (Halichoerus grypus)
Marineland, Antibes, France
Photo © www.zoochat.com
Combined species:
Institution(s): Smithsonian National Zoological Park (Washington, D.C., United States of America)
California Sea Lions (Zalophus californianus) and Brown Pelicans (Pelecanus occidentalis)
Smithsonian National Zoological Park, Washington, D.C., United States of America
Photo © Phyllis Wheeler
California Sea Lion (Zalophus californianus) and Brown Pelicans (Pelecanus occidentalis)
Smithsonian National Zoological Park, Washington, D.C., United States of America
Photo © Brent Huffman
Combined species:
Institution(s): SeaWorld Orlando (Florida, United States of America), SeaWorld San Antonio (Texas, United States of America), SeaWorld Ohio (Aurora, Ohio, United States of America) (closed), Brookfield Zoo (Illinois, United States of America), Denver Zoo (Colorado, United States of America), Louisville Zoo (Kentucky, United States of America), Indianapolis Zoo (Indiana, United States of America), Point Defiance Zoo & Aquarium (Tacoma, Washington, United States of America), Milwaukee County Zoo (Wisconsin, United States of America), Oklahoma City Zoo (Oklahoma, United States of America), Cleveland Metroparks Zoo (Ohio, United States of America), Six Flags Discovery Kingdom (California, United States of America), Ocean World (Crescent City, California, United States of America), Ocean Park Hong Kong (Aberdeen, Hong Kong), Tiergarten Nürnberg (Germany), Ouwehands Dierenpark (Rhenen, the Netherlands), SEA LIFE Blankenberge (Belgium)
California Sea Lion (Zalophus californianus) and Harbor Seal (Phoca vitulina)
Tiergarten Nürnberg, Germany
Photo © Dr. Helmut Mägdefrau
Several species of birds - like Canada Geese (Branta canadensis) and Mallards (Anas platyrhynchos) - visit freely the California Sea Lion (Zalophus californianus) and Harbor Seal mixed pool in Tiergarten Nürnberg
Tiergarten Nürnberg, Germany
Photos © Dr. Helmut Mägdefrau
Combined species:
Institution(s): Fresno Chaffee Zoo (California, United States of America)
Combined species:
Institution(s): Indianapolis Zoo (Indiana, United States of America )
Combined species:
Institution(s): Osaka Aquarium Kaiyukan (Japan)
Combined species:
Institution(s): Longleat Safari Park (Warminster, United Kingdom)
California Sea Lion (Zalophus californianus) and Common Hippopotamus (Hippopotamus amphibius)
Longleat Safari Park, Warminster, United Kingdom
Photo © Keith Park
California Sea Lions (Zalophus californianus) and Common Hippopotamus (Hippopotamus amphibius)
Longleat Safari Park, Warminster, United Kingdom
Photo © www.hiveminer.com
Combined species:
Institution(s): Tiergarten Nürnberg (Germany), Allwetterzoo Münster (Germany)
California Sea Lion (Zalophus californianus) and Common Bottlenose Dolphin (Tursiops truncatus)
Tiergarten Nürnberg, Germany
Photo © Dr. Katrin Baumgartner
Combined species:
Institution(s): Allwetterzoo Münster (Germany)
Combined species:
Institution(s): Singapore Zoo - Wildlife Reserves Singapore (Singapore)
Combined species:
Institution(s): ARTIS Amsterdam Royal Zoo (the Netherlands)
California Sea Lion (Zalophus californianus) and Black-footed Penguins (Spheniscus demersus)
ARTIS Amsterdam Royal Zoo, the Netherlands
Photo © Christopher Holland
South American Sea Lion, Otaria byronia
Combined species:
Institution(s): Parque de la Naturaleza de Cabárceno (Obregón, Cantabria, Spain)
Combined species:
Institution(s): Dalian Laohutan Ocean Park (China)
Combined species:
Institution(s): Erlebnis – Zoo Hannover (Germany)
Combined species:
Institution(s): Jardim Zoológico de Lisboa (Portugal), Zoo Heidelberg (Germany)
Combined species:
Institution(s): Ocean Park Hong Kong (Aberdeen, Hong Kong)
Combined species:
Institution(s): Riyadh Zoo (Saudi Arabia)
Combined species:
Institution(s): Mundo Marino - El Oceanario Más Grande De Sudamérica (San Clemente del Tuyu, Argentina)
Combined species:
Institution(s): Tianjin Haichang Polar Ocean World (Binhai, China)
Australian Sea Lion, Neophoca cinerea
Combined species:
Institution(s): Riyadh Zoo (Saudi Arabia)
Combined species:
Institution(s): Sea World Gold Coast (Southport, Queensland, Australia)
Combined species:
Institution(s): SEA LIFE Sunshine Coast Aquarium (Mooloolaba, Queensland, Australia)
Combined species:
Institution(s): SEA LIFE Sydney Aquarium (New South Wales, Australia)
Combined species:
Institution(s): Dolphin Marine Magic (Coffs Harbour, New South Wales, Australia)
Australian Sea Lion (Neophoca cinerea) and Common Bottlenose Dolphin (Tursiops truncatus)
Dolphin Marine Magic, Coffs Harbour, New South Wales, Australia
Photos © Nathan Edwards
Steller Sea Lion, Eumetopias jubatus
Combined species:
Institution(s): Dalian Laohutan Ocean Park (China)
Combined species:
unknown institution
Combined species:
Institution(s): Vancouver Aquarium (British Columbia, Canada)
Northern Fur Seal, Callorhinus ursinus
Combined species:
Institution(s): Erlebnis – Zoo Hannover (Germany)
Combined species:
Institution(s): Moody Gardens (Galveston, Texas, United States of America)
Combined species:
Institution(s): Zoologischer Garten Berlin (Germany)
Combined species:
Institution(s): Brookfield Zoo (Illinois, United States of America)
Combined species:
Institution(s): Vancouver Aquarium (British Columbia, Canada)
South American Fur Seal, Arctocephalus australis
Combined species:
Institution(s): WILDLANDS Adventure Zoo Emmen (the Netherlands), Zoo Dortmund (Germany), Kölner Zoo (Germany)
Female South American Fur Seals (Arctocephalus australis) and female California Sea Lions (Zalophus californianus)
WILDLANDS Adventure Zoo Emmen, the Netherlands
Photos © Krisztián Svábik
Combined species:
Institution(s): Mundo Marino - El Oceanario Más Grande De Sudamérica (San Clemente del Tuyu, Argentina)
Combined species:
Institution(s): Sea World Gold Coast (Southport, Queensland, Australia)
Combined species:
Institution(s): Tierpark Hagenbeck (Hamburg, Germany)
South American Fur Seals (Arctocephalus australis) and Walrus (the famous 'Antje') (Odobenus rosmarus), 1995
Tierpark Hagenbeck, Hamburg, Germany
Photo © www.zoochat.com
Combined species:
Institution(s): Tierpark Hagenbeck (Hamburg, Germany), SEA LIFE Sydney Aquarium (New South Wales, Australia)
Afro-Australian Fur Seal, Arctocephalus pusillus
Combined species:
Institution(s): Faunia (Madrid, Spain), Zoologischer Garten Berlin (Germany)
Combined species:
Institution(s): Faunia (Madrid, Spain)
Male Afro-Australian Fur Seal (Arctocephalus pusillus) and young Harbor Seal (Phoca vitulina)
Faunia, Madrid, Spain
Photo © Ignacio Barrio
Combined species:
Institution(s): Ocean Park Hong Kong (Aberdeen, Hong Kong)
Combined species:
Institution(s): SEA LIFE Sydney Aquarium (New South Wales, Australia)
Combined species:
Institution(s): Zoologischer Garten Berlin (Germany)
Combined species:
Institution(s): Münchener Tierpark Hellabrunn (Germany)
Combined species:
Institution(s): Borås Djurpark (Sweden)
Combined species:
Institution(s): Kolmårdens Djurpark (Sweden)
Combined species:
Institution(s): Faunia (Madrid, Spain), Aquazoo Löbbecke Museum (Düsseldorf, Germany), Taronga Zoo Sydney (New South Wales, Australia)
Combined species:
Institution(s): Tianjin Haichang Polar Ocean World (Binhai, China)
Combined species:
Institution(s): Tiergarten Nürnberg (Germany)
New Zealand Fur Seal, Arctocephalus forsteri
Combined species:
Institution(s): SEA LIFE Sunshine Coast Aquarium (Mooloolaba, Queensland, Australia)
Combined species:
Institution(s): SEA LIFE Sydney Aquarium (New South Wales, Australia)
Guadalupe Fur Seal, Arctocephalus townsendi
Combined species:
Institution(s): SeaWorld San Diego (California, United States of America)
Guadalupe Fur Seal (Arctocephalus townsendi), California Sea Lion (Zalophus californianus) and Harbor Seal (Phoca vitulina) mixed pool
SeaWorld San Diego, California, United States of America
Photo © Steve Hofhine
Subantarctic Fur Seal, Arctocephalus tropicalis
Combined species:
Institution(s): SEA LIFE Sydney Aquarium (New South Wales, Australia)
LIST OF MIXED-SPECIES EXHIBITS WITH LOCATIONS - ODOBENIDAE
The list shows specific examples of mixed-species exhibits involving the walrus combined with the taxa below, with indication of the institution(s) where these have been tried out
Walrus, Odobenus rosmarus
Combined species:
Institution(s):SeaWorld San Antonio (Texas, United States of America)
Combined species:
Institution(s): Brookfield Zoo (Illinois, United States of America)
Combined species:
Institution(s): Tierpark Hagenbeck (Hamburg, Germany)
Walrus (the famous 'Antje') (Odobenus rosmarus) and South American Fur Seals (Arctocephalus australis), 2000
Tierpark Hagenbeck, Hamburg, Germany
Photo © www.zoochat.com
Combined species:
Institution(s): Münchener Tierpark Hellabrunn (Germany)
Combined species:
Institution(s): Erlebnis – Zoo Hannover (Germany)
Combined species:
Institution(s): Tierpark Hagenbeck (Hamburg, Germany)
Walrus (Odobenus rosmarus) and Grey Seal (Halichoerus grypus)
Tierpark Hagenbeck, Hamburg, Germany
Photo © www.zoochat.com
Combined species:
Institution(s): Point Defiance Zoo & Aquarium (Tacoma, Washington, United States of America), Brookfield Zoo (Illinois, United States of America)
Combined species:
Institution(s): Indianapolis Zoo (Indiana, United States of America)
Combined species:
unknown institution
Walrus (Odobenus rosmarus) and Beluga (Delphinapterus leucas)
Photo © Rob Vuijsters
LIST OF MIXED-SPECIES EXHIBITS WITH LOCATIONS - PHOCIDAE
The list shows specific examples of mixed-species exhibits involving at least one species of phocids combined with the taxa below, with indication of the institution(s) where these have been tried out
Northern Elephant Seal, Mirounga angustirostris
Combined species:
unknown institution
Southern Elephant Seal, Mirounga leonina
Combined species:
Institution(s): Wilhelma Zoologisch-Botanischer Garten Stuttgart (Germany)
Southern Elephant Seal (Mirounga leonina) and California Sea Lions (Zalophus californianus), 1973
Wilhelma Zoologisch-Botanischer Garten Stuttgart, Germany
Photo © Alan Hill
Combined species:
Institution(s): Erlebnis – Zoo Hannover (Germany)
Combined species:
Institution(s): Erlebnis – Zoo Hannover (Germany)
Combined species:
Institution(s): Enoshima Aquarium (Fujisawa, Japan)
Southern Elephant Seal (Mirounga leonina) and Harbor Seals (Phoca vitulina), 2005
Enoshima Aquarium, Fujisawa, Japan
Photo © www.reddit.com
Bearded Seal, Erignathus barbatus
Combined species:
Institution(s): Oceánopolis (Brest, France)
Grey Seal, Halichoerus grypus
Combined species:
Institution(s): New York Aquarium (Brooklyn, New York, United States of America)
Combined species:
Institution(s): Louisville Zoo (Kentucky, United States of America), Marineland (Antibes, France)
Combined species:
Institution(s): Smithsonian National Zoological Park (Washington, D.C., United States of America)
Combined species:
Institution(s): Ocean Park Hong Kong (Aberdeen, Hong Kong)
Combined species:
Institution(s): Erlebnis – Zoo Hannover (Germany)
Combined species:
Institution(s): Indianapolis Zoo (Indiana, United States of America)
Combined species:
Institution(s): Riyadh Zoo (Saudi Arabia)
Combined species:
Institution(s): Borås Djurpark (Sweden)
Combined species:
Institution(s): Tierpark Hagenbeck (Hamburg, Germany)
Grey Seal (Halichoerus grypus) and Walrus (Odobenus rosmarus)
Tierpark Hagenbeck, Hamburg, Germany
Photo © www.zoochat.com
Combined species:
Institution(s): Indianapolis Zoo (Indiana, United States of America)
Combined species:
Institution(s): Fiskeri- og Søfartsmuseet – Sealarium (Esbjerg, Denmark), Skånes Djurpark (Höör, Sweden), Dolfinarium Harderwijk (the Netherlands), Seal Sanctuary and Wildlife Centre (Mablethorpe, United Kingdom), Detroit Zoo (Michigan, United States of America), Los Angeles Zoo (California, United States of America), Adventure Aquarium (Camden, New Jersey, United States of America), ABQ BioPark (Albuquerque, New Mexico, United States of America)
Combined species:
Institution(s): Detroit Zoo (Michigan, United States of America)
Combined species:
Institution(s): Kolmårdens Djurpark (Sweden)
Combined species:
Institution(s): Kolmårdens Djurpark (Sweden)
Combined species:
Institution(s): Los Angeles Zoo (California, United States of America)
Harp Seal, Pagophilus groenlandicus
Combined species:
Institution(s): Oceánopolis (Brest, France)
Combined species:
Institution(s): Detroit Zoo (Michigan, United States of America)
Harp Seal (Pagophilus groenlandicus) and Harbor Seals (Phoca vitulina)
Detroit Zoo, Michigan, United States of America
Photo © Brent Huffman
Combined species:
unknown institution
Harbor Seal, Phoca vitulina
Combined species:
Institution(s): SeaWorld Orlando (Florida, United States of America), SeaWorld San Antonio (Texas, United States of America), SeaWorld Ohio (Aurora, Ohio, United States of America) (closed), Brookfield Zoo (Chicago, Illinois, United States of America), Denver Zoo (Colorado, United States of America), Louisville Zoo (Kentucky, United States of America), Indianapolis Zoo (Indiana, United States of America), Point Defiance Zoo & Aquarium (Tacoma, Washington, United States of America), Milwaukee County Zoo (Wisconsin, United States of America), Oklahoma City Zoo (Oklahoma, United States of America), Cleveland Metroparks Zoo (Ohio, United States of America), Six Flags Discovery Kingdom (California, United States of America), Ocean World (Crescent City, California, United States of America), Ocean Park Hong Kong (Aberdeen, Hong Kong), Tiergarten Nürnberg (Germany), Ouwehands Dierenpark (Rhenen, the Netherlands), SEA LIFE Blankenberge (Belgium)
Harbor Seal (Phoca vitulina) and California Sea Lion (Zalophus californianus)
Ocean World, Crescent City, California, United States of America
Photo © Scott Richardson
Harbor Seals (Phoca vitulina) and California Sea Lion (Zalophus californianus)
Ocean Park Hong Kong, Aberdeen, Hong Kong
Photo © Ocean Park Hong Kong
Several species of birds - like a Grey Heron (Ardea cinerea) - visit freely the Harbor Seal (Phoca vitulina) and California Sea Lion mixed pool in Nürnberg
Tiergarten Nürnberg, Germany
Photo © Dr. Helmut Mägdefrau
Combined species:
unknown institution
Combined species:
Institution(s): Jardim Zoológico de Lisboa (Portugal), Zoo Heidelberg (Germany)
Combined species:
Institution(s): Moody Gardens (Galveston, Texas, United States of America)
Combined species:
Institution(s): SeaWorld San Diego (California, United States of America)
Combined species:
Institution(s): Indianapolis Zoo (Indiana, United States of America)
Combined species:
Institution(s): Fresno Chaffee Zoo (California, United States of America)
Combined species:
Institution(s): Riyadh Zoo (Saudi Arabia)
Combined species:
Institution(s): Sea World Gold Coast (Southport, Queensland, Australia)
Combined species:
Institution(s): Vancouver Aquarium (British Columbia, Canada)
Combined species:
Institution(s): Vancouver Aquarium (British Columbia, Canada)
Combined species:
Institution(s): Tierpark Hagenbeck (Hamburg, Germany), SEA LIFE Sydney Aquarium (New South Wales, Australia)
Combined species:
Institution(s): Faunia (Madrid, Spain), Aquazoo Löbbecke Museum (Düsseldorf, Germany), Taronga Zoo Sydney (New South Wales, Australia)
Combined species:
Institution(s): Faunia (Madrid, Spain)
Combined species:
Institution(s): Kolmårdens Djurpark (Sweden)
Combined species:
Institution(s): Point Defiance Zoo & Aquarium (Tacoma, Washington, United States of America), Brookfield Zoo (Illinois, United States of America)
Combined species:
Institution(s): Indianapolis Zoo (Indiana, United States of America)
Combined species:
Institution(s): Fiskeri- og Søfartsmuseet – Sealarium (Esbjerg, Denmark), Skånes Djurpark (Höör, Sweden), Dolfinarium Harderwijk (the Netherlands), Seal Sanctuary and Wildlife Centre (Mablethorpe, United Kingdom), Detroit Zoo (Michigan, United States of America), Los Angeles Zoo (California, United States of America), Adventure Aquarium (Camden, New Jersey, United States of America), ABQ BioPark (Albuquerque, New Mexico, United States of America)
Combined species:
Institution(s): Detroit Zoo (Michigan, United States of America)
Harp Seal (Pagophilus groenlandicus) and Harbor Seals (Phoca vitulina)
Detroit Zoo, Michigan, United States of America
Photo © www.zoochat.com
Combined species:
Institution(s): Enoshima Aquarium (Fujisawa, Japan)
Combined species:
Institution(s): Kolmårdens Djurpark (Sweden)
Combined species:
unknown institution
Combined species:
Institution(s): Central Park Zoo (New York, New York, United States of America)
Combined species:
Institution(s): Franklin Park Zoo (Boston, Massachusetts, United States of America)
Combined species:
Institution(s): København Zoo (Denmark)
Combined species:
Institution(s): Skånes Djurpark (Höör, Sweden)
Combined species:
Institution(s): Georgia Aquarium (Atlanta, Georgia, United States of America), Oceanogràfic de Valencia (Spain)
Harbor Seal (Phoca vitulina) and Beluga (Delphinapterus leucas)
Georgia Aquarium, Atlanta, Georgia, United States of America
Photo © Georgia Aquarium
Harbor Seals (Phoca vitulina) and Belugas (Delphinapterus leucas)
Georgia Aquarium, Atlanta, Georgia, United States of America
Photo © Imogen Farris
Combined species:
Institution(s): Fővárosi Állat- és Növénykert (Budapest, Hungary)
Harbor Seals (Phoca vitulina) and Black-footed Penguins (Spheniscus demersus)
Fővárosi Állat- és Növénykert, Budapest, Hungary
Photos © Krisztián Svábik
Combined species:
Institution(s): Tierpark und Fossilium Bochum (Germany), Pairi Daiza (Brugelette, Belgium)
Combined species:
Institution(s): Ouwehands Dierenpark (Rhenen, the Netherlands)
Combined species:
Institution(s): Zoo Augsburg (Germany)
Combined species:
Institution(s): Dierenrijk (Mierlo, the Netherlands)
Harbor Seal (Phoca vitulina) and White-tailed Sea-eagle (Haliaeetus albicilla)
Dierenrijk, Mierlo, the Netherlands
Photo © Ben Gilbert
Spotted Seal, Phoca largha
Combined species:
Institution(s): Osaka Aquarium Kaiyukan (Japan)
Combined species:
Institution(s): Dalian Laohutan Ocean Park (China)
Combined species:
Institution(s): Yokohama Hakkeijima Sea Paradise (Japan)
Baikal Seal, Pusa sibirica
Combined species:
Institution(s): Zoo Leipzig (Germany)
Ringed Seal, Pusa hispida
Combined species:
Institution(s): Oceánopolis (Brest, France)
SUMMARIZE THE EXPERIENCES
This document purposefully focuses on creating a list of mixed-species exhibits with family Otariidae, Odobenidae and Phocidae, for further and detailed information it is worth contacting the institutions mentioned above. Only a short summary of the general experiences is given here. Many of the listed coexistences are still ongoing at present; many of them are not anymore.
A good advice is to base the combination on the one existing in the wild: this is also very important to respect coherence between the zoological representation of the natural environment (GILI & MEIJER & LACAVE 2018).
In the wild many otariids share haul-out areas with other pinniped species, including species of phocids. In the Southern Ocean, multiple species of fur seals haul-out at the same sites, as do sea lions and fur seals, and many locations support colonies of Southern Elephant Seals and small number of species of Antarctic seals. In the North Pacific Ocean, Steller Sea Lions and Northern Fur Seals haul-out together, as do Steller Sea Lions and California Sea Lions. Six species – two sea lions, two fur seals and two phocids – co-occur, often in close proximity to each other on several central and southern California islands (WEBBER 2014).
Further example is that California Sea Lions, Harbor Seals and Sea Otters share the same habitat in the wild. The most frequent association with pinnipeds is the California Sea Lion & Harbor Seal combination, especially in the North American institutions, but the Harbor Seal & Sea Otter combination has also tried out at least in one zoological garden.
Tiergarten Nürnberg keeps California Sea Lion breeding group together with two female Harbor Seals which combination works without problem. In the enclosure by natural choice some bird species can be observed as well, like Grey Heron, Canada Goose and Mallard. The ducks bred an raised chicks. The young Sea Lions took the chicks under water and let them plop up to the surface – just for playing. The chicks survived this regular mistreatment (MÄGDEFRAU 2018, pers. comm.).
Parque da Cabarceno in Spain keeps together California Sea Lions (2.2) and South American Sea Lions (0.2) without any problems but it is worth mentioning that male Sea Lions are castrated (GALLEGO ALDAMA 2018, pers. comm.).
Zoo Dortmund kept their California Sea Lions (3.5) together with Afro-Australian Fur Seals (4.7) many years ago. Interspecific play was observed between young animals which is also a general experience of keeping different seal species together (HAMMER 2002).
Faunia in Madrid had California Sea Lions, Afro-Australian Fur Seals and Harbor Seals together three years ago. They were living all together without any problem. The staff did all the exhibitions with all of them together in the same pool and made training sessions as well. Even the reproduction with these species together was fine, the institution had calfs of Harbor Seals and Fur Seals, too (BARRIO 2018, pers, comm.).
Los Angeles Zoo kept their California Sea Lions (1.2) together with Capybaras some decades ago. The species swam and basked together. One adult female Capybara behaved aggressively against a newly naturalized young male Sea Lion which was taken out of the group (CROTTY 1981, HAMMER 2002).
An unknown institution has had a very complex combination with California Sea Lions, Northern Elephant Seal, Celebes Crested Macaques, Geladas and Capybaras. All the species kept in breeding group except the elephant seal (one female only). There was a pool with two islands on it, Macaques one one and Geladas on the other (THOMAS & MARUSKA 1996).
Tiergarten Nürnberg combined their California Sea Lion group (1.4) with Common Bottlenose Dolphin group (1.4) many years ago (HAMMER 2002). The association of the two species started in 1991 and the initial group structure was one juvenile male of sea lion with one juvenile male and two adult females of dolphins, later on changed to an abovementioned group. The volume of the pool was 1500 m³ with an adjoining 100 m² dry and roofed area for the sea lions. The enclosure was equipped with several toys and animals took part in a training program several times a day. Frequent interspecific interactions including physical contacts and simple interspecific communication between certain individuals of both species. Close sociopositive relationships were observed between the adult male sea lion and a certain female dolphin (partly resembling mating behaviour) as well as between a female sea lion and another female dolphin (playful behaviours). The other individuals sporadically join these "interspecific couples" but they are predominantly involved in intraspecific interactions. Newborn sea lions have to be separated from dolphins to prevent them from being maltreated as playmates. Sea lions and dolphins were trained and fed separately (ZIEGLER 2002). The Sea Lions had opportunity for retreat. The species were separated during feeding and Sea Lions for rearing of young, too. Afro-Australian Fur Seals were also combined with the dolpins in Nürnberg but no interspecific interactions were observed (HAMMER 2002).
Although Sea Lions get on well with dolphins and it is a very attractive mixed exhibit, leading dolphin trainers recommend that for the Sea Lions enough exits off the water should be available. These ways of flight are necessary because dolphins are sometimes very rude while playing. In addition it is recommended that leading female Sea Lions with their offspring should be separated that long till the youngsters are quick enough to escape from the dolphins (HAMMER 2002).
Riyadh Zoo in Saudi Arabia combined two species of otariids with two species of phocids – South American Sea Lions (1.1), Australian Sea Lion (0.1), Grey Seals (1.2) and Harbor Seals (1.1) – together. The male South American Sea Lion was the dominant, but not aggressive during feeding time (HAMMER 2002).
Even the Walrus can be kept together with smaller species of seals, although it is known from the wild that Walruses chase seals (HAMMER 2002). The Walrus’s main source of food is benthic invertebrates, in large part, bivalve mollusks found in the sediment in high-density beds. Their diets are variously supplemented with amphipods, snails and soft-shelled crabs. It is worth mentioning that occasionally, Walruses hunt and eat Northern Fur Seals, Bearded Seals, Ringed Seals and Spotted Seals (STEWART 2014).
Zoo Hannover kept Walrus and Southern Elephant Seal together in the 1960s but both of the animals were young and sexually immature (MÜLLER-SCHILLING 2018, pers. comm.).
PUSCHMANN (1983) quotes examples of associations of a six years old Walrus with Sea Lions and Grey Seal as well.
According to Best Practice Guidelines for Otariidae and Phocidae Earless Seals can be better accommodated in a mixed exhibit than Eared Seals (GILI & MEIJER & LACAVE 2018).
Los Angeles Zoo kept their female Grey Seals (0.3) together with Nort American River Otters (2.2) some decades ago. First the otters avoided water but in the meantime they swam around the seals (CROTTY 1981, HAMMER 2002).
Harbor Seals have been maintained in some instances with female or young Grey Seals as males might be very aggressive towards the individuals of the smaller species. A strong attention should always pay to the dominance that can emerge during feeding time. For this reason it might be easier to base the combination on differences in dominance and combine aggressive with non-aggressive species (GILI & MEIJER & LACAVE 2018).
København Zoo kept their female Harbor Seals (0.3) together with a herd of Reindeer. The species were always together: it was possible for reindeer to cross stone barrier and drank from the seal pool. Reindeer sometimes swam in the seal pool (HAMMER 2002).
Dierenrijk in the Netherlands have kept together Harbor Seals and White-tailed Sea-eagles in a walk-through aviary for more than six years without problems. When the staff fed the seals the eagles stayed in the sitting tree. As the birds started to breed and with visitors in the same enclosure this was to dangerous the institution sent them away to an other zoo (RIJNEN 2018, pers. comm.).
In mixed-species exhibits with different species of pinnipeds together it should be thought of a danger of hybridisations. Scattered crossings already occured between Arctocephalus pusillus x Zalophus californianus, Halichoerus grypus x Pusa hispida (HAMMER 2002), Zalophus californianus x Otaria byronia (BRUNNER 2002), Callorhinus ursinus x Zalophus californianus (DUFFIELD 1999, MILLER et al. 1996), Eumetopias jubatus x Zalophus californianus (GORODEZKY 1995, MILLER et al. 1996), Arctocephalus australis x Otaria byronia (MILLER et al. 1996), Arctocephalus forsteri x Arctocephalus gazella (GOLDSWORTHY 1999, GOLDSWORTHY et al. 1998, 1999, SHAUGHNESSY et al. 1998.), Arctocephalus forsteri x Arctocephalus tropicalis (GALES et al. 1992, SHAUGHNESSY 1992), Arctocephalus gazella x Arctocephalus tropicalis (GALES et al. 1992, GOLDSWORTHY et al. 1998, 1999, GUINET et al. 1994, St. CLAIR HILL et al. 2001, WYNEN et al. 2001), Arctocephalus townsendi x Callorhinus ursinus (JAMEYSON et al. 1981), Pagophilus groenlandicus x Cystophora cristata (KOVACS et al. 1997), Halichoerus grypus x Pusa hispida (LÖNNBERG 1929, MOHR 1940), Phoca largha x Phoca vitulina (KATSUMATA et al. 2003).
ACKNOWLEDGEMENTS
I would like to thank all the persons very much who helped to improve this short summary with providing information and photographs as well, in particulare:
Brian AUCONE Senior Vice President for Animal Sciences (Denver Zoo, Colorado, United States of America), Ignacio BARRIO Marine Mammal Head Keeper (Faunia, Madrid, Spain), Isabelle BRASSEUR (Marineland, Antibes, France), Beatriz GALLEGO ALDAMA Curator (Parque de la Naturaleza de Cabárceno, Obregón, Cantabria, Spain), Brent HUFFMAN Lead Keeper & Zoologist, AZA Ungulates Team (Toronto Zoo, Canada), Alex KANTOROVICH Euroasian Regional Coordinator at Species360 and Curator (Hai Park, Kiryat Motzkin, Israel), Stephen LAI Curator of Marine Mammals (Ocean Park Hong Kong, Aberdeen, Hong Kong), Agustin LOPEZ GOYA Curator (Faunia, Madrid, Spain), Dr. Helmut MÄGDEFRAU Director (Tiergarten Nürnberg, Germany), Klaus MÜLLER-SCHILLING Curator (Erlebnis – Zoo Hannover, Germany), Stephan RIJNEN Curator (Dierenrijk, Mierlo, the Netherlands), Brian SHEEHAN Curator of Marine Mammals/Amazon (Vancouver Aquarium, British Columbia, Canada)
As well as I would like to thank all the persons very much who helped to improve this document with providing further photographs, their names are listed below:
Mike BAIRD, Dr. Katrin BAUMGARTNER, Arthur CHAPMAN, Cláudio DIAS TIMM, Nathan EDWARDS, Imogen FARRIS, David FUDAN, Sergey GABDURAKHMAN, Ben GILBERT, Michael HAFERKAMP, Simon HAMPEL, Alan HILL, Steve HOFHINE, Cristopher HOLLAND, Jouni KOSKELA, Alexander MEYER, Brian M. HUNT, Scott RICHARDSON, Nicolas SERVERA, Glen TEPKE, Rob VUIJSTERS, Phyllis WHEELER
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BRUNNER, S. 2002. A Probable Hybrid Sea Lion – Zalophus Californianus × Otaria Byronia. Journal of Mammalogy, Volume 83, Issue 1, Pp. 135-144.
CROTTY, M. 1981. Mixed species exhibits at the Los Angeles Zoo. International Zoo Yearbook 21: Pp. 203-206.
DUFFIELD, D. A. 1999. Examples of captive hybridisation and a genetic point of view. European Research on Cetaceans, 12: 421-422.
GALES, N. J., COUGHRAN, D. K., QUEALE, L. F. 1992. Records of subantarctic fur seals Arctocephalus tropicalis in Australia. Australian mammalogy, 15: 135-138.
GILI, C., MEIJER, G. & LACAVE, G. 2018. EAZA and EAAM Best Practice Guidelines for Otariidae and Phocidae (Pinnipeds). Acquario di Genova, Genova, Italy
GOLDSWORTHY, S. D. 1999. Maternal attendance behaviour of sympatrically breeding Antarctic and subantarctic fur seals, Arctocephalus spp., at Macquarie Island. Polar Biology, 21: 316-325.
GOLDSWORTHY, S. D., BONESS, D. J., FLEISCHER, R. C. 1999. Mate choice among sympatric fur seals: Female preference for conphenotypic males. Behavioral Ecology and Sociobiology, 45: 253-267.
GOLDSWORTHY, S. D., WYNEN, L., ROBINSON, S., SHAUGHNESSY, P. D. 1998. The population status and hybridization of three sympatric fur seals (Arctocephalus spp.) at Macquarie Island. VII SCAR international Biology Symposium. Abstracts Handbook, New Zealand Natural Sciences, 23: 68.
GORODEZKY, L. 1995. Hybrid sea lion is suspected in Castle Rock killings. Alokoy (Channel Islnds National Marine Sanctuary, Santa Barbara, California), 8: 10-11.
GUINET, C., JOUVENTIN, P., GEORGES, J.-Y. 1994. Long term population changes of fur seals Arctocephalus gazella and Arctocephalus tropicalis on subantarctic (Crozet) and subtropical (St. Paul and Amsterdam) islands and their possible relationship to El Nino Southern Oscillation. Antarctic Science, 6(4): 473-478.
HAMMER, G. 2002. Mixed species exhibits involved mammals: stock report and problems. Dissertation. Naturwissenschaftliche Fakultät Universität Salzburg.
JAMEYSON, E. D., DUFFIELD, D. A., CORNELL, L. H., ANTONELLIS, G., DELONG, R. L. 1981. Discovery of a Callorhinus ursinus × ? hybrid within the San Miguel Island population. Fourth Biennial Conference on the Biology of Marine Mammals. San Francisco, CA.
KATSUMATA, E., HORI, T., TSUTSUI, T. 2003. Contraceptive effect of proligestone on Spotted Seals and crossbreeds of Spotted Seals and Harbor Seals. Journal of Veterinary Medical Science, 65: 619-623.
KOVACS, K. M., LYDERSEN, C., HAMMILL, M. O, WHITE, B. N., WILSON, P. J., MALIK, S. 1997. A harp seal × hooded seal hybrid. Marine Mammal Science, 13: 460-468.
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MCCARTHY, E. M. 2013. Mammalian Hybrids. www.macroevolution.net/mammalian-hybrids.html
MILLER, E. H., PONCE DE LEÓN, A. & DELONG, R. L. 1996. Violent interspecific sexual behaviour by male sea lions (Otariidae): Evolutionary and phylogenetic implications. Marine Mammal Science, 12: 468-476.
MOHR, E. 1940. Bemerkungen über Seehund, Ringel- und Kegelrobbe. Der Zoologische Garten (Leipzig), 12: 173-182.
PUSCHMANN, W. 1983. Wildtiere in Menschenhand; Band Säugetiere. VEB- Dt. Landwirtschaftsverlag Berlin.
SHAUGHNESSY, P. D. 1992. New mammals recognized for Australia — Antarctic and Subantarctic fur seals Arctocephalus species. Australian Mammalogy, 15: 77-80.
SHAUGHNESSY, P. D., ADAMS, M, GOLDSWORTHY, S. D. 1998. Hybridization of southern fur seals, Arctocephalus spp., at Macquarie Island based on allozyme analysis. VII SCAR International Biology symposium. Abstracts Handbook, New Zealand Natural Sciences, 23: 182.
St. CLAIR HILL, M., FERGUSON, J. W. H., BESTER, M. N., KERLEY, G. I. H. 2001. Preliminary comparison of calls of the hybridizing fur seals Arctocephalus tropicalis and A. gazella. African Zoology. 36: 45-53.
STEWART, B. S. 2014. Family Odobenidae (Walrus). Pp. 102-119. In: Wilson, D.E. & Mittermeier, R.A. (eds) 2014. Handbook of the Mammals of the World. Vol. 4. Sea Mammals, Lynx Edicions, Barcelona.
THOMAS, W. D. & MARUSKA, E. J. 1996. Mixed-species Exhibits with Mammals. In: Kleiman, D. G., Allen, M. E., Thompson, K. V. & Lumpkin, S. (eds) 1996. Wild Mammals in Captivity: Principles and Techniques. Chicago and London: The University of Chicago Press. Pp. 204-211.
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WYNEN, L. P., GOLDSWORTHY, S. D., INSLEY, S. J., ADAMS, M., BICKHAM, J. W., FRANCIS, J., GALLO, J. P., HOELZEL, A. R., MAJLUF, P., WHITE, R. W. G., SLADE, R. 2001. Phylogenetic relationships within the eared seals (Otariidae: Carnivora): Implications for the historical biogeography of the family. Molecular Phylogenetics and Evolution, 21: 270-284.
ZIEGLER, T. 2002. Selected Mixed Species Exhibits in Zoological Gardens. Primate Report 64.
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