Young common loon chicks rest on the back of their mother at Yellowstone National Park. A weasel blends into snow in Grand Teton. In spring it will molt and turn light brown. 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 ...

Yellowstone has the largest high elevation lake in North America, and under the surface, a fight is going on between the native cutthroat trout and the invasive lake trout. And for a long time the ...

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. Whitesitt ...

When they had their data, Smith invited me to kneel in the snow beside the big male and hold up his head for a photo ... intake than any others: cutthroat trout from Yellowstone Lake at spawning ...