A leopard frog squealed loudly the whole time within the garter's grasp, finally disappearing inside the snake after a minute or so.

"Garter snakes are meat eaters and diet consists of almost any creature that they are capable of overpowering: slugs, earthworms, insects, leeches, lizards, spiders, amphibians, birds, fish, toads and rodents.

Although long thought to be nonvenomous, recent discoveries revealed that they do in fact produce a mild neurotoxic venom. Garter snakes are nevertheless harmless to humans due to the very low amounts of venom they produce, which is comparatively mild, and the fact that they lack an effective means of delivering it." - source Wikipedia.