Frogs don't have long legs and a short body their whole life. Frogs hatch from eggs as a tadpole equipped with a long tail for swimming. As the tadpole gets older, it grows legs. When the legs are strong and fully developed, the tail begins to shorten. An adult frog has undergone many changes since its birth, including changes in its eyesight. A frog's eyes have a keen sense of depth perception. Frogs catch their prey with their long sticky tongue or with their sticky webbed feet. Frogs love to eat insects and small worms. Those that love to eat frogs, like birds and snakes, may be surprised when they are poisoned by their prey. Some frogs secrete chemicals under their skin to rid themselves of their predators.