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Odocoileus hemionus hemionus
From what I can tell in this photo it appears to have large ears and a white rump, 2 characters for the mule deer. The subspecies for Colorado is as suggested.
I am not very familiar with your deers, but I would check the white-tailed deer and mule deer first, however, there might be other ones in your area.
http://en.wikipedia.org/wiki/White-taile...
http://en.wikipedia.org/wiki/Mule_deer
Spotted on Jun 16, 2014
Submitted on Jun 17, 2014
+2
