When might no longer makes right for the strong, they think twice about preying on the weak.
Better than preying on the free will of humans.
"You're a real piece of work, preying on someone like her," Gabriel said.
They're preying on you.
Some of the inmates of ants' nests are here for the purpose of preying upon the :ants or their larvae, so that we find all kinds of relations between the owners of the nests and their companions, from mutual benefit to active hostility.