The pronghorn impressed the Corps of Discovery with its beauty, swiftness, and agility. Near Great Falls, Montana, Lewis noted, "[T]hey appear very inquisitive usually to learn what we are as we pass, and frequently accompany us at not great distance for miles, frequently halting and giving a loud whistle through their nostrils, they are a very pretty animal and astonishingly fleet and active." Though often called an antelope, the pronghorn is more closely related to the goat. The fastest four-legged animal in North America, the pronghorn ranges from Nebraska all the way to the Cascades. While populations have recovered since 1908 when they hit a low of 20,000, much pronghorn habitat, like the Red Desert of southern Wyoming, remains without protection as wilderness.

Not listed.