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Unformatted text preview: Stretches open during the downstroke Snaps back for upstroke-Body mass centralized, underneath wings-Greatest heart size to body mass ratio of birds (heart mass as a percent of body mass) o Birds .82% o Mammals .59% o Non avian reptiles .51% o Fish .2% o For birds, 350-400 bpm, hummingbirds is 1300-Thermoregulation of birds o Open their mouths a little more and more (gaping) o Or just wont fly if its too hot (+30C) o Or if its too cold (-0C) Pointed wings, low, wingloading, and calm air reduce migratory flight costs in songbirds-...
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- Spring '12