Example: [Collected via e-mail, August 2010]
Don't ask me where this was taken at, some where for sure....This is a first for me to see this.... PICTURES OF A BLACK FAWN
Photographs ©2010 by Richard Buquoi
Origins: A very unusual genetic color variation in white-tailed deer — rarer even than albinism — produces all-black offspring in that species which are known as "melanistic" or "melanic" deer. (This news account shows one such fawn born in 2005 on Colorado's Western Slope.) As noted on the North American Whitetail
Researchers admit that they aren't sure, but they say the mutation likely has been perpetuated because it offers a survival advantage. Melanistic deer are concentrated along the [Central Texas] region's drainages, where cover is thick and a dark-colored prey animal would have an edge in avoiding detection. This trait also would serve them well in the upland juniper thickets found in the same part of Texas.
Biologists say that they don't know if the circumstances that produced this genetic trait are even still in existence. Nor, for that matter, does anyone know if a single gene is responsible. Regardless, the trait seems to be in no eminent danger of disappearing.
I took the photos of the black fawn near Austin, TX. That area of central Texas seems to have a concentration of black "white-tailed" deer, although it is still extremely rare to find them. This is a wild deer, but resides in a greenbelt near a neighborhood. I took the images when the deer were roaming through the neighborhood. The two fawns in the photos are twins, but only the one is black. The images being circulated were taken in May  and I again captured some images of them about seven weeks later which I added to our website. They are going to be published along with an article about "Melanism" in "Deer and Deer Hunting" magazine due out in September .
Last updated: 16 May 2015