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Chapter 30

Chapter 30. MAMMALS. MAMMALS. Existed for 200 million years Therapsids - features of both reptiles & mammals. All mammals have: 1. Hair 2. Mammary glands. Hair: ~ Keratin. CLASS MAMMALIA. Hair: ~ Insulation ~Waterproofing ~Conserve heat. CLASS MAMMALIA.

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Chapter 30

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  1. Chapter 30 MAMMALS

  2. MAMMALS • Existed for 200 million years • Therapsids - features of both reptiles & mammals

  3. All mammals have: 1. Hair 2. Mammary glands

  4. Hair:~Keratin

  5. CLASS MAMMALIA • Hair: ~Insulation ~Waterproofing ~Conserve heat

  6. CLASS MAMMALIA • Mammary glands - secrete milk

  7. CLASS MAMMALIA • 4-Chambered Heart • Endotherms • Cooling • Panting or sweat glands

  8. CLASS MAMMALIA • Modified limbs 1. Opposable thumbs 2. Various joint types

  9. CLASS MAMMALIA • Diaphragm • Well-defined teeth 1. Incisors - biting 2. Canines - tearing flesh 3. Molars - chewing

  10. Primates - most intelligent group of animals: - Complex behaviors:- Learning and remembering- Highly developed brains

  11. Parental care -Guard young and teach them

  12. Three types of mammals: 1. Monotremes 2. Marsupials 3. Placental Mammals

  13. MONOTREMES • Reproduce by laying eggs • Only in Australia, Tasmania, New Guinea • 3 species alive today • Spiny anteaters (echidnas) – 2 species • Duck-billed platypus

  14. MARSUPIALS • Marsupial - short period of development in uterus, second period inside a pouch • Mostly in Australia • One U.S. species

  15. PLACENTAL MAMMALS • Female carries its young inside the uterus until almost completely developed • Gestation - time spent in uterus

  16. Uterus - hollow, muscular organPlacenta - O2, nutrition, wastes VAGINA

  17. COW DIGESTION Cud Chewing - breaking down plant materials (cellulose)

  18. Only in India!

  19. THE END!

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