Pronghorns (Antilocapra americana) are presumably the second-fastest land animal in the world; only the cheetah is faster. Pronghorns have been reported to have top speeds anywhere between 70-100 km/h (43-62 mi/h). The buck in the image is taking some time to ruminate though. Click here for other images of the pronghorn.
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Pronghorn (Antilocapra americana) buck, ruminating, Montana, USA