Mule Deer is cousin to whitetail deer species.  The Mule deer differs from the whitetail in the color of their tail, they have larger ears (thus "mule deer"), and their antlers are different in that they fork.  They can run but usually hop on all four feet much like a blackbuck antelope.  The mule deer shed their horns around February much the same time as the whitetail and also like the whitetail, mule deers' horn begin growing back almost immediately upon shedding.