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Whales

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  • 1. Whales
  • 2. Evolution• From land mammals• Related to horse and sheep
  • 3. Temperature Regulation• Blubber – Also aids with buoyancy• Muscle movement generates heat• Body parts are not exposed to elements,instead are all tucked in
  • 4. Oxygen• Blowhole on top of the head-better placement foranimals who spend time with head under water• Huge lungs that can fill/empty quickly (2 sec)• High gas exchange rate-whales absorb 90%,humans only absorb 2% of oxygen• Can slow heart rate & shunt blood from non-vitalorgans when diving
  • 5. Anatomy• Streamlined• Adults – no hair• Internalized body parts(penis, mammary glands,ears) reduce friction• No hind limbs• Fluke = tail; up/down;used for identification
  • 6. Senses• Echolocation – biological sonar• Excellent hearing – songs used for communication• Good eyesight (except in dark where echolocationis used instead)
  • 7. Special Adaptations• Collapsible lungs for when diving• Nostrils stay shut while diving• Do not get “the bends” (accumulation of Nitrogenbubbles from diving)
  • 8. Two Whale Types• Suborder Odontoceti –Toothed Whales• Suborder Mysticeti –Baleen Whales
  • 9. Odontoceti – The Toothed Whales• Grab food with teeth, don’t chew• Chase/hunt food so can dive deeper than baleenwhales• Most don’t migrate and travel in Pods (groups)• Examples: Sperm, Orca, Pilot, Dolphin, Porpoise
  • 10. Mysticeti – The Baleen Whales• No teeth – instead 600-800 baleen plates to filterkrill through accordion-like pleats under mouth• Their food lives nearer to surface, so they aren’tdeep divers• Examples: Blue,Humpback, Right
  • 11. Reproduction• Internal fertilizationand development• Bear live young• Nurse young• Young growextremely quickly• Low birth weight
  • 12. Behaviors• Breaching – jumping completely out of water• Spyhopping – face up out of water• Beaching – swimming up onto beach andoften dying when stuck there
  • 13. IssuesWhaling:– Nearly wiped out many species– Was for food, oil, etc.– Marine Mammal Protection Act (MMPA) – banshunting/harassing marine mammals– International Whaling Commission (IWC) – makesregulations pertaining to whaling

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