The American bullfrog (Rana catesbeiana or by some authorities as Lithobates catesbeianus) often simply known as the bullfrog in Canada and the United States, is an aquatic frog, a member of the family Ranidae, or “true frogs”, native to much of North America. This is a frog of larger, permanent water bodies, swamps, ponds, and lakes, where it is usually found along the water's edge. On rainy nights, bullfrogs, along with many other amphibians, travel overland, and may be seen in numbers on country roads.
American bullfrogs live longer in warm weather. They have been widely introduced across North America (see range map). The original, naturally determined range did not include the far western regions where it is found today.