Lewis & Clark's Montana Discoveries...

Clockwise from top left: bull snake, grizzly bear, greater sage grouse,
 bison, arctic grayling, westslope cutthroat trout;
ChucknGale Robbins photos

...included all the above except for bison, which at the time were found all across the midwest, in parts of the northeast and southern Canada. In total the expedition is credited with discovering 172 animal species--mammal, bird, fish and reptile--and several hundred plant species new to science, most of which, including bison, were and still are found today in Montana