 They can also look through things. So if a dolphin is looking at you with sonar, it can look straight through your body. So they have this capacity to kind of see things in a completely different way to us when they're in the water. They also, and I think this is really remarkable, they seem to be able to, when dolphins are swimming together, they can't just hear their own sonar bouncing back and forth, but they can hear the sonar of the other dolphins as well.