Light, Toothless beak Center of gravity Gizzard instead of teeth Large “keeled” sternum Tail bones lost/fused Into pygostyle
Light or dark meat? It’s all about flight physiology!
So unidirectional flow What’s the advantage??
Coordinating flight Cerebellum Bird Brain
Secondary cavity nesters Primary cavity nesters
Altricial Precocial Sex determined by sex chromosomes, not temperature
Song from Syrinx “double flute”
Migration Shearwater 40,000 miles/year
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