A group of deer is called a herd. A group of roe deer is referred to as a bevy.
Male deer, or bucks, tend to stay with the female does until they have mated. After mating, the bucks leave while the does birth and raise the babies, which are known as fawns. Once a male fawn reaches about one year of age, he will head out on his own to find a mate.
The white-tailed deer is prevalent throughout the United States, and can be seen in almost every state, except for Hawaii, Alaska and some warmer climates, such as New Mexico and Nevada, according to Florida State University. Deer need to live near a water source and vegetation in order to survive on their own or within the herd.