Quote from Marcus in Angels and Mermaids
Marcus: I wish I were a mermaid. I would clean up. Kelly: I think you'd be a mer-man. Amy: Yeah, I don't really buy mermen as a thing. Cheyenne: Then how did they use to, you know... [bleep]? Unless that's why they went extinct. Marcus: [scoffs] They didn't go extinct. They lost their tails over the course of centuries and turned into humans. It's called evolution. Jonah: I don't think so. Marcus: Okay, fine, God made us.