It's like something out of an animal horror movie -- killer frogs take over peaceful pond, then after terrorizing and eating everything alive, start eating each other. Only it's no movie. It's really happening in Golden Gate Park's Lily Pond, near the California Academy of Sciences. And after watching the frogs chew through everything in sight over the past several years, the city finally wants to do something about it. No one knows for sure when the African clawed frogs got into the pond or who put them there. But there they are, and the Toad Warriors have pretty much taken care of the native turtles, frogs and fish. "They've eaten everything they can get their mouths around, and now they're eating each other," said Eric Mills of the animal rights group Action for Animals. Mills worries that the fiendish amphibians -- which grow to 5 inches in length and have claws on the toes of their oversize hind feet -- may jump the pond and spread their reign of terror across other Bay Area waterways, although so far, none has popped up elsewhere. "The fear is they will get out,'' said Richard Schulke, president of the city's Animal Control and Welfare Commission.