"Fenrir Greyback is, perhaps, the most savage werewolf alive today. He regards it as his mission in life to bite and to contaminate as many people as possible; he wants to create enough werewolves to overcome the wizards. Voldemort has promised him prey in return for his services. Greyback specializes in children … Bite them young, he says, and raise them away from their parents, raise them to hate normal wizards."
(GIF’s not mine, credit to owner)