Board Thread:Questions and Answers/@comment-36518227-20180903022808/@comment-29325824-20180903075650

First question, no they don't. At all. Mamono hate killing and certainly don't eat each other. Even the solely-carnivorous Mamono only eat animals, never sapient beings like humans or each other. See, Mamono don't take the place of the setting's animal life like Pokémon do. They are completely seperate and some just happen to resemble certain animals.

Second question, while there are species of Mamono known to have rivalries with each other, and that sometimes may lead to a fight if they are after the same man or have a disagreement, there is no such thing as Mamono factions being genuine enemies. All Mamono share the same goals after all, so infighting would not just be pointless, but also harmful.