A thought;
Concerning natural predator / prey relationships within the animal kingdom. Would something similar exist with monstergirls?
Werewolf vs weresheep
Mantis vs devilbug
Toad vs fairy
Spider vs moth
Would monstergirls have natural enemies? Would / do monstergirls fight each other? How far would they take rivalry and battle amongst themselves?
I have read a bit within this wiki, maybe not enough if the answer is in here. But, I thought I'd ask.