Marine Mammals

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Marine Mammals
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What makes a mammal, a mammal?
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How are marine mammals different from fish?
Similar?
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Order Cetacea

• Baleen whales
• Toothed whales
• Inc. dolphins and porpoises

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Baleen

• Like hair and nails
• Fringed
• Why adapted for such small food?

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Compare fish and cetaceans

• How is fin structure and motion different in
  cetaceans?

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Whale tail picture with flukes
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How do cetaceans breathe?

• Through blowhole
• Forces air out first spout

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Adaptations (1 hour underwater!)

• Large lungs
• Higher blood O2 capacity
• Max O2 to brains

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Whale Species

• Orca whales (aka killer)
• Sperm whale (largest toothed)
• Blue whale (largest whale baleen)

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Pinnipeds

• Seals, sea lions, walruses
• Flipper-like limbs
• Hind flippers like flukes
• Cold water regions

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Pinnipeds

• Come ashore to rest, mate, bear young
• Most seals cant use limbs on land

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Seal vs. Sea Lion

• Sea lions are seals with external ears
• Sea lion can sit on front limbs

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Walruses

• No external ears
• Can use limbs on land
• Tusks (long canine teeth)

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Otters

• Related to weasels and skunks
• 4 limbs
• Webbed paws and flat tails

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Duck-billed Platypus

• Egg-laying mammal
• Flat beak grubs for worms

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Sea Cows

• Manatees and dugongs
• Flipper-like forelimbs, remnants of hind limbs
• Large tail fluke
• Plant eaters

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Coral snake
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Scarlet Kingsnake
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Kingsnake
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Raccoon
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Mink
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River Otter
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Beaver
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Nutria
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Muskrat
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Water Shrew