I've seen Mountain Lion tracks in Brewster county between Del Rio and Alpine. Also seen them a few miles south of Iraan, TX.
I have never seen a wild mountain lion of any color. But it seems reasonable there could be some black ones.
Two of my friends drove into deer camp one night saying they had seen a black panther, but no one else believed them because they had been drinking and they had only a wire hanging out of the truck door where they had drug off their radar detector.
Lotsa stories like this one.
Everyone knows someone that claims to have seen a big black cat.
Not one shred of proof of it ever though... Not one dead one, not one credible photo, not one shot or run over. Ever.
