Abstract
Abstract We measured tarsal and body temperatures of four species of large falcons in relation to rising ambient temperature and found that the tarsus has an apparent thermoregulatory function. Statistical efforts to separate the birds into ecological or plumage types yielded mixed results. An index of tarsal surface area per unit body weight was correlated with the temperature regimens of the birds, with species from the hottest climates having the greatest tarsal index values.
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