The word Amphibia is formed from the Greek word amphi meaning both and bios meaning life. Animals of this class were the first to conquer land. They are known as amphibians because they live in water and on land. There are currently 7,700 living amphibian species. Among them 715 species of amphibians with tails, 200 species of amphibians without legs and 6,785 species of amphibians with four legs. 2 classes, 4 tribes, 47 frogs and 2 Sicilian amphibians have been identified in Bangladesh.