Class Mammalia order Pinnipedia (Seals, Sea Lions & Walruses) order Carnivora (Sea Otters) order Cetacea (Whales, Dolphins & Porpoises) order Sirenia (Manatees & Dugongs)

Pinnipeds Seals Sea Lions Major differences: Sea Lions can move back flipper forward Sea Lions have external ears Sea Lions males have external testicles Sea Lions lack toes w/ claws Sea Lions

Walruses

Exception: Monk Seals Pinnipeds usually live in cold water Have a thick layer of blubber for insulation, food reserve & buoyancy Bristly hair & large size conserve body heat (less surface area) Exception: Monk Seals These seals live in warm climates Two species are rare: Mediterranean & Hawaiian One species is extinct, last seen in 1952: Caribbean Seals hunted for skin, meat & oil

c. 1910 Caribbean Monk Seal Last seen In 1952

Sirenians Closest relatives to manatees & dugongs are elephants The only true vegetarians among marine mammals The extinct Steller’s sea cow was the largest @ 25-30 feet Sirenians Steller’s Sea Cow

Dugong