human
How many species of frogs are there in the world?
assistant
There are over 5,000 species of frogs in the world, and that number is growing. Frogs are amphibians, and there are two main groups of frogs: the tree frogs and the froglets. Tree frogs have external gills and a tail, while froglets have internal gills and no tails. The most common frog in the world is the bullfrog.