Whilst in the Forbidden Forest, why not stop for a lesson in Care of Magical Creatures? To do this you will need to consult the Monster Book of Monsters.
The Monster Book of Monsters, by Edwardus Lima, can be a rather vicious textbook. Only by stroking its spine will you be able to placate it and open it.
Please ensure the cache is replaced out of the weather. Be cafeful when reaching in to retrieve the cache - you don't want to lose any fingers!