You are wrong, the most adaptable animal on the planet, they are the zebra mussel of the 4 legged critter world.
Also, you think you want them right up to the point you actually get them and realize how destructive they are. They will push deer and other animals out of an area, they'll do the same with elk. They will literally eat anything, plant or animal, including each other.
Also, you will have them before you realize that you have a problem, because when you see the signs, they are already established in the area.