the wilds of yuganda, walking a few feet away from your distant biological cousin. they are exquisitely amazing primates. >> and dolphins, you sent roxie, our friend the dolphin there, away, because you didn't want roxie to know you were talking about chimps. what's your take on their emotional complexity? >> roxie is bored with me. i was her toy. i was her boy toy for a little bit and she's moved on to more fun things. but dolphins are equally remarkable. recently we were filming ocean mysteries off the coast of polynesia, and we were down and surrounded by hundreds of sharks. the sharks went away, and then by our side were a pod of dolphins. almost as if to say, we've got your back. they are amazing creatures. these animals are the top dog in their ecosystem. their brains are so advanced, and so developed, that they