A moose (Alces alces; called elk in Europe) is a large deer. Some authorities put the American moose in a different species, Alces americanus. A male moose is called a bull, a female moose is called a cow, and a young moose is called a calf. A group of moose is called a herd. The plural form of moose is moose.. Moose live in northern Europe, Asia, and in North America.