Knarls are a fictional species featured in the Harry Potter series.
Knarls resemble hedgehogs in every way, except for their innate magic. Because of it, knarls have a higher intelligence than normal hedgehogs. Because of this, where a hedgehog will gladly eat food left in its vicinity by a human, a knarl will suspect a trap and ignore the offering. Hedgehogs are lactose intolerant, and milk left by humans kills them. The Knarls' reaction may suggest that they are aware of this fact. Because of their magic, knarls' bodies contain many ingredients useful in brewing magic potions, such as their quills.