Was at my grandparent's house this weekend and saw the deer are having some issues with their hair. It was mostly effecting the yearlings, it looked like they were nawing off their hair. One had a mow-hawk on its back, looked stylish but not healthy. I talked to my dad about it and he said it was lice. Is this true. Or is it some hair disease? Anybody have some knowledge on this topic? Is it fatal?