Illustrated Guide of Marine Mammals
Balaenidae
Neobalanidae
Eschrichtidae
Balaenopteridae
Physeridae
Kogiidae
Ziphiidae
Platanistidae
Iniidae
Lipotidae
Monodontidae
Delphinidae
Phocoenidae
Dugongidae
Trichechidae
Phocidae
Otariidae
Odobenidae
Mustelidae
Ursidae
Marine Mammals Information Database
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National Museum of Nature and Science ,Tokyo