Yellowstone cutthroat trout
The Yellowstone cutthroat trout (Oncorhynchus clarkii bouvieri) is a type of  cutthroat trout (Oncorhynchus clarkii). It is a freshwater fish in the salmon family (family Salmonidae).  It lives in only to a few U.S. states. At first it only lived upstream of Shoshone Falls on the Snake River and tributaries in Wyoming, across the Continental Divide in Yellowstone Lake and in the Yellowstone River and its tributaries downstream to the Tongue River in Montana. The species is also found in Idaho, Utah and Nevada.