Not like carrion animals, though. They hunt.

[Phrasing that delicately is a true challenge, but he's trying.

How to explain the thing when one is a case of What Has Science Wrought and is therefore half-the-thing...]

There are cases of mutation as a result of preying on other ghouls in great amounts, but otherwise, the result is an accumulation of RC cells. Those cells are used in a number of their functions.