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4 Cards in this Set
- Front
- Back
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Physical Adaptations
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-Feathers: lightweight but tough
-Skeleton: pneumatized, rigid vertebral column, ribs fused with vertebra, pectoral girdle, and sternum -Muscles: large pectoralis, supracoracoideus muscle (raises wing), both anchored to keel of sternum -Endothermy -Efficient digestive system -Keen sight and sound -Reproduction: testes enlarge during breeding, only one functional ovary -Most monogamous -Nesting -Migration |
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Feather growth
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-Types: Vaned, Down, Contour
-Develop from epidermal elevation of skin--do not flatten like scales of reptiles -keratin deposited towards end -sheath splits apart |
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Feather molting
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-Highly ordered
-flight and tail lost in exact pairs -replacements emerge before next pair is lost -many water birds lost all primary feathers at once and are grounded during molt -penguins molt all at once |
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Mating strategies
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-Most monogamous
-females choose males that can offer high investment to young -males acquire territory before mating -sing to attract females |
