I used to have a little panther who visited my front porch when I lived in the East Texas woods. He would have armadillos on the half shell and leave the remains under leaves in my flower beds. Like lots of animals in deep woods, he was a darker brown with dusky grey back - unlike the tawny color you usually see. Coyotes in New England are darker than Texas coyotes, as are the deer. Perhaps that's what people are calling "black panthers."