ANTH-110 Lecture 5: assign5
25 Mar 2016
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Well adapted to marine, freshwater, & terrestrial habitatsmsimagelistmsimagelist msimagelist. Evolution: evolved from reptiles, few fossils due to lack of preservation of feathers or thin, hollow bones, archaeopteryx, 1. Possible link between birds & reptiles: 2. Large skull with reptile like teeth: 4. Strong legs & rounded wings for gliding: 8. Furculum - fused collarbone or wishbone: hesperonis:1. Feathers: modified scales, function to provide lift for flight & help conserve body heat, five kinds of feathers ----- down, contour, flight, filoplume, & bristles. Provide an undercoat insulating adult birds: contour feathers:1. Give additional insulation to body: flight feathers:1. Microscopic hooks on barbules: birds preen their feathers to clean them & coat them with oil, preen glands - oil glands located at the base of the tail, birds shed or molt feathers periodically 1. Molting usually in late summer between breeding & migration2. Beaks and feet: adapted to habitat & feeding, hawks & eagles have hooked beaks & talons for tearing meat.
