 The skin has small dark freckle-like spots clustered towards the tail, and is mostly orange-hued.They can be distinguished from rainbow trout by the red, pink, or orange marking beneath the jaw (hence the name "cutthroat").Westslope cutthroat trout are native in northern Idaho's and British Columbia's upper Columbia River system and northern tributaries of the Snake River, but not the Snake River's main stem to the south.