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About the Cover
Cover:
One of the smallest flying vertebrates, a rufous hummingbird, takes to flight from a perch instrumented with strain gauges to measure forces exerted by the bird's diminutive hindlimbs (photo by Douglas Altshuler). The inset graph shows vertical and horizontal reaction forces during take-off. B. W. Tobalske, D. L. Altshuler and D. R. Powers demonstrate the consequences of morphology and motivational state upon take-off performance in hummingbirds (p. 1345-1352).
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