| Arctocephalus galapagoensis Galapagos fur seal Status: Vulnerable (IUCN) Synonyms: Galapagos Islands Fur Seal, Arctocéphale Des Galapagos, Oso Marino De Las Galápagos |
| Arctocephalus gazella Antarctic fur seal |
| Arctocephalus townsendi Guadalupe fur seal Range: U.S.A. (Farallon Islands of CA) south to Mexico (Islas Revillagigedo) Status: Vulnerable (IUCN), Threatened (ESA) Synonyms: Guadalupe Fur Seal, Lower Californian Fur Seal, Arctocéphale De Guadalupe, Otarie À Fourrure D'amérique, Oso Marino De Guadalupe |
| Balaenoptera musculus Blue whale Range: Oceanic Status: Endangered (IUCN), Endangered (ESA) Synonyms: Sulphur bottom whale, Sibbald's rorqual, blue rorqual, great blue whale, great northern rorqual, Ballena azul, rorqual bleu, baleine bleue |
| Balaenoptera physalus Fin whale Range: Oceanic Status: Endangered (ESA) |
| Callorhinus ursinus Northern fur seal Status: Vulnerable (IUCN) |
| Delphinus delphis |
| Eschrichtius robustus |
| Eumetopias jubatus Steller sea lion Range: North Pacific rim from Northern Japan through the Bering Sea to Northern California. Status: Endangered (IUCN), Endangered (ESA) Synonyms: Northern sea lion |
| Globicephala macrorhynchus Shortfin pilot whale Range: Oceanic Synonyms: short-finned pilot whale |
| Grampus griseus Risso's dolphin Synonyms: risso dolphin, risso whale |
| Hydrurga leptonyx Leopard seal |
| Lagenorhynchus obliquidens |
| Leptonychotes weddellii Weddell seal |
| Lobodon carcinophagus Crabeater seal Synonyms: Crab-eater seal |
| Megaptera novaeangliae Humpback whale Range: Oceanic Status: Vulnerable (IUCN), Endangered (ESA) Synonyms: humpbacked whale, hump back whale |
| Mirounga angustirostris Elephant seal Synonyms: elefante marino, sea elephant, sea cow |
| Mirounga leonina Southern elephant seal |
| Orcinus orca Killer whale |
| Phoca vitulina richardsi |
| Physeter macrocephalus Sperm whale Status: Vulnerable (IUCN) Synonyms: Cachalot, Pottwal, Potvis, Kaskelot, Spermhval, Capodoglio, Cachalote, Balaia, Phisetiras, Burhvalur, Makkoh kujira, Sea guap |
| Pseudorca crassidens False killer whale |
| Stenella attenuata Pantropical spotted dolphin |
| Stenella frontalis Atlantic spotted dolphin |
| Stenella longirostris |
| Thysanoessa spinifera Krill |
| Trichechus manatus West Indian manatee Range: U.S.A. (southeastern), Caribbean Sea, South America Status: Vulnerable (IUCN), Endangered (ESA) Synonyms: Florida Manatee, Common Manatee, American Manatee, Caribbean Manatee, North American Manatee, West Indian Manatee, Lamantin D'amérique Du Nord, Lamantin Des Antilles, Lamantin Des Caraïbes, Lamantino Norteamericana, Manatí Norteamericano |
| Tursiops truncatus |
| Zalophus californianus California sea lion Status: Vulnerable (IUCN) Synonyms: lobo marino, sea dog, sealion |