Frogs usually have smooth, moist skin and spend most of their lives in or near water. Toads usually have dry, warty-looking skin and spend more time living on land. Scientifically, things are a more complicated. Here is the family tree that shows how the frog and toad families are grouped.
Frogs are beneficial to humans because they eat so many insect pests.
Some large species of frogs, like the African bullfrog , will try to eat just about anything, including other frogs as well as small fish, reptiles, and mammals. Since frogs don't have sharp teeth or claws to defend themselves against predators, the best thing they can do to avoid being eaten is to escape as quickly as possible when they spot a hungry-looking animal approaching them. Some kinds of frogs can jump distances up to 20 times their own body length in a single leap. When disturbed, frogs often jump into a puddle or pond where they can hide underwater. Their erratic zig-zag jumping on land also serves to confuse potential predators.