About a decade after a quickly growing weed and a vicious frog species infested a secluded pond in Golden Gate Park, San Francisco officials say they are close to a solution. Once a crystal-clear ...

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 ...

SAN FRANCISCO – California biologists are expressing alarm over the latest invasive species to take up residence in this city: African clawed frogs, which can survive tough conditions, eat just about ...

Walk over to the pond in Sue Bow-ser’s North End yard and at first all you see is an idyllic little pool almost covered in green lily pads and an occasional lily pad bud stalk. Then you look again and ...