(7) BirdsMammals

(7) BirdsMammals - Class Aves - Birds 9,000 species Great...

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Class Aves - Birds 9,000 species Great uniformity of structure
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Evolution Theropod Dinosaurs Archaeopteryx 27 Modern Bird Orders Ratite Carinate Flightless Flat sternum Weak pectorals Flighted Keeled sternum Strong pectorals
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Feathers - Epidermal derivative, keratin - molt 1x/yr
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Skeleton - Bones with air cavities (pneumatized) - Wings - Legs for grasping
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Wings Elliptical Wings Elliptical Wings - Large wing slots, broad elliptical surface - High maneuverability i.e. chickadee, warbler, dove, woodpecker High Speed Wings High Speed Wings - Swept back to slender tip - Fast flight i.e. swallow, hummingbirds, plover, gulls, terns
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Wings Soaring Wings Soaring Wings - Long narrow wings - Exploit ocean currents i.e. albatross, gannets, frigate birds High-lift Wings High-lift Wings - Broad wing, high lift at low speeds - Land soarers, predators with heavy loads i.e. eagles, hawks, owls
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Fast, efficient digestive system High Metabolic Rate Double circulation, 4 chambered heart, fast HR Endothermy Uric Acid Separate sexes, Internal Fertilization,
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(7) BirdsMammals - Class Aves - Birds 9,000 species Great...

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