Their early history is unknown. It is unclear why they were pit in cages. It's also unclear why they were apparently unfed.
In Emotivity - Morality, when they see Burukku and Defect Mogeko, they go wild and try to get at them, even though they are stuck in cages.
In Bad End 3, they escape their cages and devour Defect Mogeko, they then eat Burukku alive.
Cannabalistic maneaters. And completely insane.