The tail is also important feature of the whitetail deer. The underside of the tail is white, hence the name whitetail deer. The tail has an average length of 11-14 inches. The main function of the tail is to worn other deer of danger. When a deer feels threatened it raises its tail like a flag to warn other deer of the possible threat.
Deer are the only animals that grow antlers.
In fact, antlers are the fastest growing tissue in the animal kingdom. Unlike horns, antlers are made up of living tissue and are shed annually. Antlers usually only grow on males. In some species, however, such as reindeer, antlers grow on both sexes. Antlers growth is regulated by the length of the day.