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

2. 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

3. Walruses

4. 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

5. c. 1910
Caribbean
Monk Seal
Last seen
In 1952

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

7. Dugong