I recently became aware of an issue that was discovered when several rabbits were rescued from a hoarding situation. I don't have all the details and many of them would be unpleasant to include here, but the relative facts are;
Mouse over the below to read relevant details, not for the squeamish.
When faced with an over population of unaltered rabbits, male baby rabbits were housed in the same cage as their father. In more than one case the father mutilated the kits, in once case nibbling off most of the front toes of one, in another case a father removed a rear foot from his son.
I know from experience that neutered male rabbits tend to be more accepting of sharing space than female rabbits. So I was somewhat surprised to learn of this occurring. I am looking for reliable references documenting the occurrence and contributing factors. First hand experience that can shed light on the issue, may also prove to be helpful.
Note: Rabbit cannibalism is observed occasionally in female rabbits, generally attributed to environmental conditions, occurring with very young kits (live or stillborn) where the mother can reasonably be assumed to believe that existing or future young will be benefitted by action. Ref1, Ref2