Brilliant Hagrid's Hut Interior
Hagrid's Hut, Hogwarts
Knarls resemble a common garden Hedgehog in such an indistinguishable manner that they live in most Muggle gardens. Knarls differ only in the way they react to gifts. While it is common practice to leave a saucer of milk as a gift to a Hedgehog, doing the same for a Knarl will result in the destruction of the owner's garden. Many a Muggle child has been wrongly accused of this Knarl-caused destruction.