What might happen to a desert animal if you move it to the tundra?

Oh, dude, if you pluck a desert animal from its sunny paradise and plop it into the freezing tundra, it's not gonna have a good time. Like, it's gonna be all, "Where's my cactus? Where's my warm sand?" It'll probably struggle to adapt to the cold and different environment, maybe even freeze its little desert toes off.