The coyote, also called prairie wolf or brush wolf, is a smaller and more lightly built than the wolf. Noted for its nightly serenades of yaps and howls, the coyote is primarily nocturnal, running with tail pointed downward and sometimes attaining a speed of 64 km per hour (40 mph). Historically, the eastern border of its range was the Appalachians, but the coyote has expanded its range and now can be found throughout the United States and Canada.