Cutthroat trout, seen here spawning in the Gros Ventre River, are highly prized by anglers. Adapted to cold water, they’re threatened by a warming climate—and in Yellowstone Lake, by non ...

Cutthroat Trout are Idaho's "state fish," and the Westslope Cutthroat Trout is one of three subspecies native to the state, along with the Bonneville and Yellowstone Cutthroat Trout.

Yellowstone cutthroat trout are on the brink of extinction as invasive lake trout continue to eat them. With the park's ecosystem at risk, it's up to scientists to figure out where these predators ...