|“||I have lived here in the forest ever since, where Hagrid still visits me. He even found me a wife, Mosag, and you see how our family has grown, all through Hagrid's goodness...||„|
|~ Aragog about the Acromantula_Colony.|
The Acromantula Colony, also known as Forbidden Forest Acromantula Colony, is an enormous colony of Acromantulas living deep in the Forbidden Forest just outside of Hogwarts School of Witchcraft and Wizardry. Composed of a single family sired by Aragog and his mate Mosag, these hungry spiders who built this colony and made it their home almost ate Harry Potter and Ron Weasley in their trip to the forest, but are forbidden by Aragog to harm Rubeus Hagrid.
The colony was born from two parents, Aragog and Mosag. Aragog came to the Forbidden Forest after he was framed by Tom Marvolo Riddle for attacking students at Hogwarts in 1943, leading to Hagrid's expulsion from the school and Aragog having to flee for his life. A sympathetic Dumbledore convinced the then headmaster, Armando Dippet, to let Hagrid stay at the school as a groundskeeper. This new position allowed Hagrid to help Aragog to settle into the forest and care for him. Along the way, he illegally acquired another Acromantula, Mosag, and the two spiders sired hundreds (and maybe even thousands) of children, possibly even becoming grandparents or great-grandparents as well.
The Chamber of Secrets
When Harry and Ron were investigating the identity of the monster responsible for the renewed attacks at Hogwarts, Hagrid was placed under suspicion once more and taken into custody by the Ministry of Magic and sent to Azkaban. Hagrid told Harry and Ron to "follow the spiders" when he was arrested; the boys assumed he meant the small spiders living within the castle, but soon found out it referred to the colony after they followed the escaping spiders to the Forbidden Forest.
The Acromantulas seized the boys when they found the Weasleys' Ford Anglia in the forest. The spiders took them to meet Aragog and he told them to kill the humans, but Harry said they were Hagrid's friends and Aragog told them of Hagrid's innocence, stressing that similar events had happened before, and that the "ancient evil" responsible terrifies all spiders.
However, rather than letting them leave peacefully, Aragog decided to let his children eat them, to which the excited progeny took as permission to attack immediately. The use of well - timed spells, luck, and help from the Ford Anglia saved Harry and Ron from being devoured.
The Half-blood Prince
Aragog was dying after he became seriously ill, and the Acromantulas desperately wanted to cannibalize him, but Hagrid put them off until Aragog did die. Hagrid scrambled into the colony and smuggled out Aragog's body from the woods before they did eat him. Hagrid, Harry, and Professor Horace Slughorn attended the strange funeral, with the latter praising the colony as "continuing Aragog's legacy" in his eulogy.
The Deathly Hallows
During the Battle of Hogwarts, the Death Eaters invaded the Forest at the beginning of the battle and drove out many creatures, among them Acromantula, who in turn invaded Hogwarts itself. All the students and teachers saw them, and the Death Eaters themselves ran from the monstrous spiders. Harry and Ron used Stunning charms on them, and Hagrid ran down to stop the humans hurting the spiders; the spiders converged on him, dragging him out into the Forest. The Acromantulas returned to the Forest and presumably set up a new colony elsewhere in the Forest.
- It's unknown whether or not the colony was composed entirely of Aragog and Mosag's children, or if it also included grandchildren, great-grandchildren or the like.
- Unlike their patriarch Aragog, no other Acromantula colony member spoke in a human language, this could be due to their ignorance of them or having a preference not to speak to humans.