Mm. Beasts eat their dead. [A bit disgusting, but true. Take the nutrients in their bodies, fill their bellies, and move on.]

No, humans left me in the forest, and a witch found me. Then one day, I decided I'd had enough of humans, and cast away what little humanity I have left to become a monster.

[Of course, there is a lot he's skipping, but he's not about to elaborate.]