Deer are part of the Cervidae family that include moose, reindeer, elk and other species.A male deer is usually called a ‘buck’. A large male deer is often called ‘stag’. A female deer is usually called a ‘doe’. A young deer is usually called a ‘fawn’. A group of deer is known as a ‘herd’. Deer have long legs typically suited to the environments they live in. They can jump high and swim well. Most deer are born with white spots but lose them within a year. Deer take their first steps within half an hour of their birth. Young deer will usually stay with their mother for around a year. Source: Animal Facts