Abstract
Female Eptesicus fuscus , sampled biweekly from an attic roost in Byron, Shiawassee Co., Michigan, from 25 April through 26 September 1990, were aged, weighed, sexed, and photographed with left wing extended. From photographs, the following measurements were taken: length of forearm, distance from elbow to point of maximum radius curvature, displacement of radius at that point, width of wing at digit V, and length of wing tip. A significant curvilinear relationship was found over time for maximal curvature displacement of the radius. Forearm curvature decreases throughout pregnancy and most of lactation, and then increases until summer-roost abandonment. This arrangement may increase foraging efficiency by improving lift and maneuverability, and offset increased wing loading.
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