Frogs and other amphibians don't just look and sound cool—they also feast upon the insects that feast upon the plants we eat. These bug-scarfing creatures are a free source of what is known as biological pest control. But modern industrial agriculture doesn't have much use for them. It leans on chemistry, not biology, to control pests—and in doing so, it's probably contributing to the catastrophic global decline of amphibians, a natural ally to farmers for millennia. The irony is stark: in industrial agriculture's zeal to wipe out pests, it is helping to wipe out those pests' natural predators. The latest evidence: a new study showing that exposure to common pesticides at levels used in farm fields can kill frogs rapidly.