Frogs are amphibians in the order Anura (meaning “tailless”, from the Ancient Greek an-, without + oura, tail). Most frogs are characterized by a short body, webbed fingers and toes, protruding eyes, cleft tongue and the absence of a tail. They are excellent jumpers and many of their anatomical characteristics, particularly their long, powerful hind legs, are adaptations to improve jumping performance. Due to the permeable nature of their skin, through which they can breathe, many frogs are semi-aquatic or inhabit humid areas. They also live on land even in arid regions and some species inhabit trees or burrow in the ground. They typically lay their eggs in water and their larvae, called tadpoles, are aquatic and have gills and tails. Most tadpoles are herbivorous but adult frogs have a carnivorous diet, mostly consisting of insects, spiders, worms, slugs and snails. Frogs produce a wide range of calls particularly in their breeding season.