Creatures
Norbert
Norbert is a Norwegian Ridgeback dragon hatched from an egg won by Rubeus Hagrid. The hatchling is illegal, bites Ron, and is smuggled out of the castle to a reserve in Romania, where Charlie Weasley later says she is living as Norberta.

First mention
Harry Potter and the Philosopher's StoneChapter: Norbert the Norwegian Ridgeback
The egg hatches in Hagrid’s hut during Harry’s first year, and the chapter follows the plan to get the dragon off the grounds.