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It is not that simple. mtDNA (maternal DNA) of mule deer are very similar to that of a whitetail meaning they possibly originated from the same species a long time ago. However many experts believe that the mule deer and the blacktail deer are in fact conspecific, or the same species. The reason they think this is because of the hybridization that occurs in nature between mule and blacktail deer. There are very few wild hybrid whitetail mule deer cross, and the ones that are discovered have a short life. Not sure if it has something to do with genetics or something else. I found all this on Wikipedia under the taxonomy part of the mule deer page.http://en.wikipedia.org/wiki/Mule_deerBrandon
I'm no expert, but if whitetails and blacktails crossed, wouldn't muley's be smaller??
Usually hybrids are larger than the two species that made it.