Black fawn

Those pic's are super glad you posted them!

lol

I'd imagine that is a genetic melanin disorder. That deer seems to display almost 100% of them melanism trait, pretty neat, as a lot of times melanism doesn't fully "penetrate" and you get a mixture of colors. I bet the fawn will lighten up some as it gets older, but hopefully it gets a chance to pass on it's genetics, as these things don't pop up very often.

Similar to the piebald condition seen more frequently, correct? Anyway it's pretty cool.

Yessir.

The only reason I know this stuff is because some of the snakes I breed carry desirable genetic mutations that make them more expensive....and cooler looking....so knowing the likely outcomes of your breedings is helpful when planning them.