Light,

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Light, Toothless beak
Center of gravity
Gizzard instead of teeth
Large keeled sternum
Tail bones lost/fused Into pygostyle
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Powering flight
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Static soaring
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Light or dark meat? Its all about flight
physiology!
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Powering flight muscles
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So unidirectional flow Whats the advantage??
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Coordinating flight
Bird Brain
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Secondary cavity nesters
Primary cavity nesters
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Altricial
Precocial
Sex determined by sex chromosomes, not
temperature
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Attracting a mate
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Song from Syrinx double flute
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Migration Shearwater 40,000 miles/year
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Blackpoll Warbler 15 g ----2 for one stamp 80-90
hours nonstop
Migrate Canada to South America Neotropical
migrant Red yellow 12000 miles
If they were burning gasoline instead of fat,
they'd be getting about 720,000 miles to the
gallon