In The Rockies, Climate Change Spells Trouble For Cutthroat Trout

Native westslope cutthroat trout swim in the north fork of the Flathead River in northwestern Montana. However, cutthroat trout populations are threatened by hybridization from mating with rainbow trout.

Native cutthroat trout, an iconic part of the mountain West, thrive in cold streams. But warmer weather has allowed invaders to move in — and it’s killing off the cutthroats.

(Image credit: Jonny Armstrong/USGS)