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About the Cover
Cover:
A chukar partridge engaged in wing-assisted incline running (WAIR), which is a novel locomotor behavior used by several species of cursorial ground birds wherein the bird preferentially uses its wings to push its hindlimbs against the surface. This wing function allows these animals to use terrestrially based locomotion at steep inclines not normally possible for bipeds. The graph shows representative and simultaneous acceleration (red) and force-plate recording (blue) from a chukar engaged in WAIR on a 70¡ incline. For details, and a discussion of whether WAIR might represent a functional starting point for the evolution of flight in birds, see the article by M. W. Bundle and K. P. Dial, pp. 4553-4564.
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