Order Only - forest challenge

We haven't much time this go around, so I'll get straight to it.

To all you adults who do or have spent time at Hogwarts, what do you know about the layout of the Forbidden Forest? Or of the migration patterns of the creatures living there? The insight of those of you who have taught Care of Magical Creatures is particularly welcome. Mr Macnair, I seem to recall that you were always coming in and out of the Forest, and that you were always growling cautioning us to stay out of there. Have you any advice?

Here's our task:

Happy Vernal Equinox!

We know you have all been waiting impatiently for the end of winter and the beginning of spring. Why not celebrate with a walk in the woods?

Sometime before supper is served on Sunday, go to the Forbidden Forest and bring back an artefact belonging to a dangerous magical creature you find there. For example, a fire crab shell, a thestral's tail, an ashwinder egg, an acromantula fang, perhaps a werewolf's head. We'd even accept a Centaur's bow - if you can manage to capture one.

Beware of trolls. Good luck.