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The Smaller Marine Mammals

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by

Mark Van Arsdale

on 19 January 2016

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Transcript of The Smaller Marine Mammals

Pinnipeds
Otariidea
(sea lions and fur seals)
Manatee and Dugong
Sirenia
Sea Otters
Mustelindea
http://www.arkive.org/sea-otter/enhydra-lutris/
Ursus
http://www.arkive.org/polar-bear/ursus-maritimus/video-00.html
Pinnipeds and the smaller marine mammals
Polar Bears
All have back flippers that they can walk on
Phocidea (earless seals)
Can't walk on, but swim with their hind fins
http://www.arkive.org/stellers-sea-lion/eumetopias-jubatus/video-00.html
http://www.arkive.org/antarctic-fur-seal/arctocephalus-gazella/video-00.html
Antarctic Fur Seal
Steller Sea lion
http://www.arkive.org/common-seal/phoca-vitulina/video-06.html
Harbor Seal
Elephant Seal
Obobentidea (walruses)
Some characteristics similar to the seals and some to sea lions, can you tell which?
Walrus
http://www.arkive.org/walrus/odobenus-rosmarus/video-di00.html
smallest marine mammal
keystone species
huge appetites
thick, dense fur
slow moving herbivores
sea grass eaters
vulnerable to boat strikes
Alaska once had a sirenia, the extinct Seller Sea Cow
Can be classified as "marine mamals because of their dependence on the sea for food
th
Vulnerable to sea ice decline
All have swim with their front flippers
All have external ears
Most have larger males than females (sexual dimorphism)
They have no external ears
19 species most of which live in the high latitudes
Fewer examples of sexual dimorphism
they have no external ears
some sexual dimorphism
they can walk on their hind flippers
Hey what's the deal with the tusks?
http://www.npr.org/2014/12/14/370670678/more-than-just-cute-sea-otters-are-superheroes-of-the-marsh
Completely dependent upon sea ice for feeding
Seal eaters
Bodies are highly adapted for swimming, narrow snout, wide but, large paddle feet
Full transcript