Endangered by Global Warming

Many, many years ago -- eons, probably -- this species of mountain trout developed a fur coat to take a bit of the chill off the icy streams in which it lives. Now, global warming has caused the temperature of those streams to rise. Will the trout adapt to its environment once again by shedding its fur coat? Will it swim north to Canada, where it runs the risk of death by boredom? Or will it go the way of the dino and the dodo?