Gallatin River
The Mottled sculpin "(Cottus bairdi)" is widely distributed in Yellowstone streams and rivers below the major falls. It occurs in the Fall River, Snake River, Shoshone River, Yellowstone River and Gallatin River drainages. With one exception, it occurs only below the major waterfall barriers on the Firehole (Firehole Falls), Yellowstone (Knowles Falls) and Fall river drainages. When the park waters were first surveyed in the 1880s–90s by biologists, they discovered a population of Mottled scuplin in the Gibbon River above Gibbon Falls, a water otherwise barren of fish. No scientific explanation for this has yet been developed.