When I was younger we were out hunting and found a friendly, starving stray about to pop with kittens. We took it home and a few days later it gave birth to 5 kittens. 3 were born dead, the other 2 ended up fine. 2 of the dead ones looked normal but I shit you not, though it was not open, 1 had a single eye in the middle of it's forehead. Creeps me out still every time I time about it. It was one of those memories that kinda burns a picture in you head forever.