As the group headed to the Upper Missouri River, Lewis took a day to stretch his legs and explore the new landscape. In this country of deep ravines and open plains, he noticed acres of prairie dogs poking out of their burrows. Predators waited for their chance at a prairie-dog meal, most hiding in the grass or circling overhead, others lurking underground.
Spending much of the day out of sight below the soil surface, the black-footed ferret wasn't described until the naturalist John James Audubon wrote about it in 1851 (though Lewis recorded seeing "pole cats," which may have been a reference to the ferrets). No one else commented on the ferrets for another 26 years. But the animal's elusive nature didn't keep it out of trouble. The lithe creature with a black bandit mask was destined to become one of North America's most endangered mammals.
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