Acromantula

Acromantulas are giant spiders that feature in the Harry Potter books. The only one of these named in the books is Aragog, appearing first in Harry Potter and the Chamber of Secrets, who is Hagrid's 'pet'. The acromantula can speak in human languages and have a poison in their pincers. The venom of an acromantula is said to be highly valuable, as described upon Aragog's death in Harry Potter and the Half-Blood Prince.Acromentulas will devour anyone that comes near them as hinted in Harry Potter and the Chamber of Secrets by Aragog and confirmed inHarry Potter and the Half-Blood Prince when Hagrid says "Can you belive that Aragog was the only thing that kept the other spider fom attacking me?"
See more at Wikipedia.org...