<human>:  How many species of wrens are there in the world?
<bot>: There are about 240 species of wrens in the world. The Carolina wren is a member of the wren family. The Carolina wren is a small bird that is about 5-6 inches long. It has a black head and a white body. It has a white stripe on its chest and a white stripe on its belly. It has a black tail and a white stripe on its wings.