Good observation ccrock. You will also note her black trimmed ears. I see this color pattern often in Webb County, Texas for some reason. The deer in Webb County tend to be darker faced with this black ear and "mane" down the back of their necks for some reason.
Also noteworthy is the fact I normally trap anywhere from 500-900 deer each year using a helicopter and net gun. These black faced and ear tipped and maned deer are much meaner than the other color phases. Not sure what that has to do with anything other than when I approach one of these "blackies" in the net, I know to spread my feet apart, bend my knees, stiffen up my back and make sure my A game is on because when I grab her to load her up, there WILL BE a fight! They like to growl, beller and even bite like a dog sometimes! I can't tell you how many hundreds of times I have been bitten by a deer while handling them after capture. I am assuming it is a "flight or fight" instinct since they are obviously scared and unsure of what my intentions are. I am very glad deer only have front lower incisor teeth and not fully "armed" like a dog when in the biting position. The deer tend to bite and retract like a rattlesnake and not bite and hang on like a dog. Just thought that was sort of an interesting observation, but not sure of it's value to anyone in particular!
I love deer,