The practical examination took place in the afternoon on the lawn on the edge of the Forbidden Forest, where students were required to correctly identify the Knarl hidden among a dozen hedgehogs (the trick was to offer them all milk in turn: Knarls, highly suspicious creatures whose quills had many magical properties, generally went berserk at what they saw as an attempt to poison them); then demonstrate correct handling of a Bowtruckle; feed and clean out a Fire Crab without sustaining serious burns; and choose, from a wide selection of food, the diet they would give a sick unicorn.