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Walrus

Walrus. Pair of large tusks used for defense and anchoring Feeds on marine inverts. Sea otters Polar bears. Order Carnivora Smallest marine mammal Lacking blubber layer Uses fur for insulation Protected in 1911. Order Carnivora Reside on ice in the Arctic Feed primarily on seals.

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Walrus

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  1. Walrus • Pair of large tusks used for defense and anchoring • Feeds on marine inverts

  2. Sea otters Polar bears • Order Carnivora • Smallest marine mammal • Lacking blubber layer • Uses fur for insulation • Protected in 1911 • Order Carnivora • Reside on ice in the Arctic • Feed primarily on seals

  3. Manatees and Dugongs • Order Sirenia • Only strict vegetarians • Feed primarily on seagrass • Reproduce slowly • Overhunted and habitat loss led to a decline in numbers

  4. Whales, Dolphins, Porpoises • Order Cetacea • Largest group of marine mammals • Streamline body • Convergent evolution with fish – different species develop similar characteristics from sharing similar habitats and behavior

  5. Cetacea • Horizontal flukes • Blowhole – single or double nostril on head • Toothless filter-feeders or balleen whales: • Flexible fiber plates made of keratin protein with bristles that catch food • Largest whales – blue whale, fin, minke, humpback

  6. Toothed whales • Teeth catch and hold, not chew • One opening in blowhole • Includes dolphins and porpoises

  7. Questions to you • What is echolocation? • What is the Marine Mammal Protection Act of 1972? • Describe the culture of whaling. • How are whales designed for swimming and diving? • Describe whale behaviors, ie. Social, breeching, beaching, etc. • Describe whale migrations. • Describe whale reproduction.

  8. www.science-art.com/image.asp?id=2622&search=1 • www.flickr.com/groups/marinemammals/ • moneyman730.googlepages.com/walrusevoulation • www.treehugger.com/polar-bear-rule-coal-plant.jpg • www.wildnatureimages.com/S%20to%20Z/SEAOTTER..jpg • www.fhwa.dot.gov/.../images/manatees(sfwmd).jpg • faculty.mccfl.edu/.../OCE1001/Images/whales2.jpg • www.elephantseal.org

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