Guard duty at dusk. These pronghorn antelopes (male, female, and juvenile), were part of a larger 11-antelope herd seen at dusk in Yellowstone National Park. They had formed a line alongside the top of a small ridge, and each of the 11 were facing a different direction, keeping an eye out for predators. My research told me they are the fastest-running mammal in Yellowstone, with the ability to run 55 miles per hour.
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