 Or domestic animals have their own specific class body. Birds and fish all have their own specific class bodies. And different bodies are able to do different things. For example, a fish can live underwater. One German writer said if a fish could actually think, and there were philosophers in the fish world, probably the philosophers of the fish world would be saying, you know, I'll bet you nobody can live outside of water. They don't have any clue what's going on outside of water. That's all they know, that they live underwater. But try that with your dog.