Um....If they were to be in zoo's and weren't in cold temperature's, then they would die. Yeah, your not very smart, are you? Their bodies are used to the cold, why do you think their fur is white and thick? Their fur is white so they can blend in with the snow and ice. Their skin is thick so they can live in the cold without actually, well dying in the cold. Now let's see if you can survive out in the cold!