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Birds (Characteristics (Feathers (specialized outgrowth of the birds skin,…
Birds
Characteristics
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Feathers
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birds fluff their feathers to capture air in between its skin and down feather to regulate body temperature. 
Lightweight bone
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The sternum is connected with the collar bone creating a wish bone to increase surface area for muscle attachment
Feeding and digestion
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Birds have gizzards because they lack teeth, has small stone to crush food
Respiration
Flight muscles need alot of oxygen for high ATP for muscle attachment for more efficient cellular respiration
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