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University of California
Ucmp: Vertebrate Flight
A very solid Berkeley site on the structure and function of bird flight. Topics include skeletal and muscular adaptations for flight.
Smithsonian Institution
National Museum of Natural History: American Mammals: Southeastern Pocket Gopher
Equipped for a subterranean life, the Southeastern Pocket Gopher's muscular front legs, thick-set front body, massive claws on its front feet, small eyes and ears, and incisors protruding beyond the lips are obvious adaptations to life...