The titmouse and the chickadee are both small songbirds that can be identified by their distinctive calls. The titmouse is a bit larger than the chickadee, about five inches long, with a pointed crest on its head and a longer tail. The chickadee is smaller, only about four inches long, with a rounded crest on its head and a shorter tail. The titmouse is usually greyish-brown in color with a white belly, while the chickadee is usually brownish-black in color with white patches on its wings and tail. The titmouse also has a louder and more varied call than the chickadee's soft "chick-a-dee-dee" song.