Niffler!
Uitleg:
Nifflers are kept by Goblins to burrow for treasure.
During the 1994–1995 school year, Rubeus Hagrid used them as part of the Fourth years Care of Magical Creatures class. Prior to class he hid Leprechaun gold all around his hut. He paired each student with a niffler and promised a prize to who found the most gold. Ron Weasley asked Rubeus Hagrid if they could buy these Nifflers as pets, and with knowledge, Hagrid said no. When Hagrid caught Gregory Goyle pocketing the gold he explained that trying to steal it was pointless as Leprechaun gold was worthless because it disappeared after a few hours. Ron's niffler found the most gold so Hagrid rewarded him with chocolate from Honeydukes.
''They're taking the hobbits to Isengard.'' - Legolas