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Mammals Chapter 28
Evolution of Mammals
 
Derived Characteristics of ALL mammals ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Characteristics of MOST mammals ,[object Object],[object Object],[object Object]
Skin & Hair
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
Hair
Horns & Antlers
Glands
Skull Characteristics 1. Nasal size related to reliance on sense of smell. 3. Eyes in front vs. eyes on side. 2. Large ears
Food and Feeding
Food and Feeding
Migration
Migration
Flight and Echolocation
Flight and Echolocation
Locomotion 1. Cursorial 2. Ambulatory 3.  Saltatorial 4.  Oscillatory amphibious aquatic marine 5. Volant 6. Gliding  (could be arboreal) 7. Arboreal 8. Fossorial
Territoriality
Reproductive Cycles Estrous cycle   monestrous polyestrous
Monotremes
Marsupials
Marsupials
Eutherians – Placental Mammals
Eutherians – Placental Mammals

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Mammals

Notas del editor

  1. Mammals, class Mammalia , are represented by more than 5,000 species. Kitti’s hognosed bat from Thailand weighs 1.5 g. Blue whales exceed 130 metric tons.