Anurans (frogs and toads) are one of the three Orders of amphibians. The other two Orders are Salamanders and Caecilians -- limbless amphibians found only in the tropics. Anurans are the most diverse Order of amphibians with some 4000 species worldwide, accounting for approximately 90% of all species of amphibians. Frogs and toads are generally tailles, with long hind legs modified for hopping. They range in body length from approximately 1-30 cm. In Canada, the largest species is the Bullfrog, which can grow to over 15 cm in length.