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.