2. Mammals Rule!

3. Mammal Notes Marine Mammals: - 65 million years ago dinosaurs disappeared and mammals thrived

4. early mammals

5. Class - mammalia Endothermic Hair or fur. Whales have stray hair on chin. Viviparous- embryo receives nutrients and O 2 from placenta Mammary glands for milk production - nurse young Produce few young and care for them (prudent) Large brain and more complex behavior

7. Order - pinnipeds (seals, sea lion) Predators- feeding on fish and squid Streamline bodies to swim Live in cold H 2 O Thick layer of fat- blubber for insulation, for energy reserve and buoyancy Bristly hair and large size conserves body heat

8. pinnipeds- pinni means wing or fin and pedis means foot

9. Seals- rear flipper cannot move forward on land. Pull forward with front flippers, no ears, hunted for their skin, meat, and blubber Sea lion- eared seals, move rear flippers forward, can walk on front flippers

11. sea lion and seals

12. Walrus- The largest pinniped, the only one with tusks. Whiskers- mystacial vibrissae- are very sensitive, acting as feelers, used in foraging. Walruses change color, pink when warm, and cinnamon when cold.

13. Walrus migrate with the ice floe Growth rings on cross section of teeth Tusks can reach 1 m in length, which are modified canine teeth. Tusks used in male dominance, making holes in ice, haul out on ice, and forage for food.

14. Air sac under throat, are used as floatation device while sleeping. Feed on invertebrates, able to open clams with powerful suction created in mouth. Walrus only predators are Orca, Polar Bears and Humans.

15. Scrimshaw- art work on walrus tusks

16. Order - Carnivora Sea otter- Smallest marine mammal No blubber Insulation with dense fur-attracted fur hunters Weight between 45 and 65 lbs. Eat 7-9 Kg. 15-20 lbs., of food per day Use rock to crush shells