Why did my rats eat each other?

I had a cage of male dumbo eared rats. They always got along and were very tame. They were not starving. They were overweight. To my horror while i was cleaning their cage i noticed the skeletal remains of their father and the smallest male half eaten in the corner. It was disgusting! Why would they turn on each... show more I had a cage of male dumbo eared rats. They always got along and were very tame. They were not starving. They were overweight. To my horror while i was cleaning their cage i noticed the skeletal remains of their father and the smallest male half eaten in the corner. It was disgusting! Why would they turn on each other like that?? ewwww!!!
Update: And their cage was huge..so no they were not cramped together
7 answers 7