Locomotion in the Fossil Vulture Teratornis

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Abstract
A comparative study of the muscle scars on the bones of Teratornis and the condor, Gymnogyps, together with a myological study of all New World vultures, reveals that the fossil Teratornis, which weighed perhaps 50 lbs., used a modified flapping mode of flight. On the ground the vulture was inept; its legs tended toward a graviportal stance and were adapted to carry the wt. of the body, and not for moving swiftly or agilely.

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