One of the LFS's that I used to go to had a really nasty 3' African lungfish. Whenever I stopped by I'd ask to see him eat. The owner was always happy to show it off. He'd grab one of the crayfish he was selling and dangle it above the water. The lungfish would jump up and grab it. You could hear all the crunching and stuff. It was pretty messy, but really cool. It almost made my daughter cry though. lol