chapter 42: birds

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origin and evolution of birds

characteristics of birds

beak

feathers

wings

lightweight, rigid skeleton

endothermic metabolism

unique respiratory system

heart that has two separate ventricals

furcula- fused collarbone of a bird

flight adaptations

hollow bones

rigid skeleton

efficient lungs

flight muscles

endothermic metabolism for energy

parts of a feather

vane

shaft

barb

barbules

hooks

preening- birds spread special oil from a preen gland to clean their feathers and for social cues

*know anatomy of a bird*

migration- movement from one place to another when seasons change