A child Jack loves eating live rats. Nothing bad happens to him when he does it. His parents are embarrassed that their child Jack lives on live rats.

His stomach dies if he eats normal food. If he needs to eat normal food he dies. Their parents gives him live rats when Jack needs to eat them. By the time their child ate all the live rats. There were no more around to eat but Jack became extinct. Once Jack grew up dying of starvation by not eating live rats.