Deer are most social during winter- when food is scarce. In the summer a deer s coat is reddish tan. It turns medium gray in the winter. This helps deer blend in with their environment. The hairs on a deer are hollow in winter to provide better insulation from cold.
Hollow hairs trap the deer's body heat.
The deer family is the only group of animals in the world that grow antlers. The deer family includes elk, moose, caribou, and mule deer. It sounds silly, but deer are actually aged by checking their teeth, not by counting points on antlers. A trained biologist looks at both the type of teeth the deer has as well as how worn they are. Deer have a set of baby teeth just like humans.