Mammals

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Mammals

  1. 1. Mammals Chapter 28
  2. 2. Evolution of Mammals
  3. 4. Derived Characteristics of ALL mammals <ul><li>Endotherms </li></ul><ul><li>Mammary glands </li></ul><ul><li>Skeletal </li></ul><ul><li>4 chambered heart </li></ul><ul><li>Enucleated RBC </li></ul><ul><li>Muscular diaphragm </li></ul>
  4. 5. Characteristics of MOST mammals <ul><li>Live birth </li></ul><ul><li>Corpus callosum </li></ul><ul><li>Placenta </li></ul>
  5. 6. Skin & Hair
  6. 7. Integument (outer boundary layer) 1. Color variation of skin a.Sun protection b. Dominance displays 2. Provides protection by derivatives such as hooves, claws, nails, horns and antlers. 3. Holds hair/fur: (evolved from scales) 4. Holds glands a. Sweat b. Sebaceous c. Scent
  7. 8. Hair
  8. 9. Horns & Antlers
  9. 10. Glands
  10. 11. Skull Characteristics 1. Nasal size related to reliance on sense of smell. 3. Eyes in front vs. eyes on side. 2. Large ears
  11. 12. Food and Feeding
  12. 13. Food and Feeding
  13. 14. Migration
  14. 15. Migration
  15. 16. Flight and Echolocation
  16. 17. Flight and Echolocation
  17. 18. Locomotion 1. Cursorial 2. Ambulatory 3. Saltatorial 4. Oscillatory amphibious aquatic marine 5. Volant 6. Gliding (could be arboreal) 7. Arboreal 8. Fossorial
  18. 19. Territoriality
  19. 20. Reproductive Cycles Estrous cycle monestrous polyestrous
  20. 21. Monotremes
  21. 22. Marsupials
  22. 23. Marsupials
  23. 24. Eutherians – Placental Mammals
  24. 25. Eutherians – Placental Mammals

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