How many species of frogs are there?

 There are over 3500 species of frogs – and more are being discovered every year. Frogs have evolved in a wide range of sizes, shapes and colours that enable them to survive on land, water, and on trees. Some frogs are totally aquatic, and live only in the water. Some like the mole frog, cannot swim, and live only on land. Others live near ponds and streams, and are at home both on land, and water. But whether it is on land, water or on trees, frogs have mastered the art of survival through their camouflaging abilities, defensive mechanisms, and their adaptability.