Mammals
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Transcript of Mammals
![Page 1: Mammals](https://reader035.fdocuments.us/reader035/viewer/2022070320/55893635d8b42a39398b4738/html5/thumbnails/1.jpg)
Mammals
Chapter 28
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Evolution of Mammals
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Derived Characteristics of ALL mammalsEndotherms
Mammary glands
Skeletal
4 chambered
heartEnucleated RBC
Muscular
diaphragm
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Characteristics of MOST mammals
1. Live birth2. Corpus
callosum
3. Placenta
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Skin & Hair
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Integument (outer boundary layer)
1. Color variation of skina.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 glandsa. Sweat
b. Sebaceous
c. Scent
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Hair
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Horns & Antlers
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Glands
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Skull Characteristics
1. Nasal size related to reliance on sense of smell.
3. Eyes in front vs. eyes on side.
2. Large ears
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Food and Feeding
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Food and Feeding
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Migration
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Migration
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Flight and Echolocation
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Flight and Echolocation
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Locomotion1. Cursorial2. Ambulatory
3. Saltatorial
4. Oscillatoryamphibious aquatic marine 5. Volant 6. Gliding (could
be arboreal)
7. Arboreal
8. Fossorial
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Territoriality
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Reproductive Cycles
Estrous cycle
monestrous
polyestrous
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Monotremes
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Marsupials
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Marsupials
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Eutherians – Placental Mammals
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Eutherians – Placental Mammals