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12 Cards in this Set
- Front
- Back
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Why are bird feathers thought to have evolved from scales? |
They're epidermal derivatives composed of keratin |
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What are feather tracts called? |
Ptyerlae |
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What are a birds only glands called? |
Uropygial glands |
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What type of bones do birds have? |
Cancellous |
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What supports tail feathers of a bird? |
The pygostyle |
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What is the synsacrum? |
A fusion if vertebrae that forms a thin, platelike structure |
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What is the unicate process for? |
Strengthen ribcage via posterior attachment |
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What bone carries the flight feathers? |
The ulna |
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What bones carry the primary feathers? |
Wrist and digits |
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What parts are the stomach divided into? |
-proventriculus -ventriculus (gizzard) |
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What do the intestines absorb? |
Water and nutrients |
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What is the syrinx? |
The voicebox |
