Aragog belongs to a special giant spider species called the "acromentula". For the record, it is Hagrid who welcomes him in a dungeon but he is threatened by Tom Riddle since he accuses him of having opened the chamber of secrets. Aragog is then hidden in the Forbidden Forest where Hagrid brings him a female acromentula with which he will breed. It is in this context where Harry Potter and Ron Weasley narrowly escape their children who would like to make their meal.
Discover this beautiful collection of magical creatures from the Harry Potter universe! Here is the figurine of Aragog, the acromentula of Hagrid.