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An Acromantula is a species of giant spider, native to the rainforests of Southeast Asia, particularly Borneo where it inhabits dense jungles. Acromantulas are believed to be a wizard-bred species, designed to guard dwellings or treasure hoards, and were first created before the Ban on Experimental Breeding in 1965. These giant spiders with a taste for human flesh were first spotted in 1794.

Physical description

"Spiders. Not tiny spiders like those surging over the leaves below. Spiders the size of carthorses, eight-eyed, eight-legged, black, hairy, gigantic. The massive specimen that was carrying Harry made its way down the steep slope toward a misty, domed web in the very centre of the hollow, while its fellows closed in all around it, clicking their pincers excitedly at the sight of its load."
—Harry Potter's description of the acromantulas[src]
Acromantulas sport eight, black eyes (white if blind) and are typically covered in thick black hair, with a leg span that can reach up to fifteen feet. They are the size of a carthorse, if adult.

They possess a set of giant chelicerae which they use to eat live prey or their own dead kin. Their pincers produce a clicking sound when they are agitated or excited.[1] They also secrete poison when excited.[2] They are sentient, and capable of human speech.

The fangs contain highly toxic venom, valued at 100 Galleons a pint.[3]


The female is usually larger than the male, and can lay up to one hundred soft, wide, beach ball-sized eggs at a time. They usually hatch in six to eight weeks.[1] Acromantula eggs are a Class A Non-Tradeable Material.[1]


Acromantulas tend to reside in thick jungles and heavily forested areas, and their webs are large and dome-shaped.[1][4]

Acromantulas in the Wizarding World

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Acromantulas in Hogwarts

A colony of Acromantulas was established in the Forbidden Forest at Hogwarts School of Witchcraft and Wizardry by Aragog and his mate, Mosag. At first, Hagrid used to keep Aragog in a cupboard box in the school's dungeons. Aragog was released into the Forest by Rubeus Hagrid at about the time of the 1943 opening of the Chamber of Secrets[4]

During the Third Task of the Triwizard Tournament in 1995, an Acromantula was positioned close to the Triwizard Cup. Harry Potter and Cedric Diggory joined forces to defeat it.[5]

The Forbidden Forest Acromantula colony participated in the Battle of Hogwarts in 1998, when the Death Eaters drove them out of the Forest, and towards Hogwarts Castle. Rubeus Hagrid was captured by the Death Eaters after he was lost among the swarm in his efforts to protect Aragog's offspring.


The name Acromantula has the Greek ακρος (acros/acro), meaning high or "peak," and -mantula, from the English "tarantula." True to their name, Acromantulas are massive arachnids who tend to spin their expansive webs high in tree tops. Despite the names bearing a phonetic similarity to Tarantulas, they appear more like Wolf Spiders and are, in all depictions, araneomorphae.

The eight eyes of the Acromantula are used to symbolize the number eight in the runic alphabet.[6]

Behind the scenes

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  • The Acromantulas in the film more closely resemble wolf spiders than actual tarantulas.
  • In Fantastic Beasts and Where to Find Them, Ron pens an added nine "X"s to the Acromantula's Classification. This is a reference to his fear of spiders.
  • The basilisk is the worst enemy of all spiders, feared so much that the spiders do not even speak of it, similar to how wizards of Harry Potter's world view Lord Voldemort and use a euphemism in place of his name. It is their greatest threat due to the basilisk's killing gaze and the fact that spiders have many eyes that they are unable to close, thus making them highly vulnerable targets. 
  • In the films, Acromantulas have two big eyes, at the height of human eyes, with a line of four small eyes underneath and an eye on each side of the head, human temple height. This is a detail that is not specified in the books. 
  • The spider that Ron faced off in the film adaptation of Harry Potter and the Prisoner of Azkaban closely resembles a Black widow, with the exception of its size.
  • In Harry Potter and the Forbidden Journey, riders encounter Acromantulas in the Forbidden Forest portion of the the ride.

See also


The Harry Potter Wiki has 38 images related to Acromantula.

Notes and references

  1. 1.0 1.1 1.2 1.3 Fantastic Beasts and Where to Find Them (real)
  2. Harry Potter Bloomsbury Glossary: Acromantula: exact quote: Monstrous eight-eyed, hairy spiders capable of human speech. Carthorse-sized and carnivorous, they have eight legs and sharp pincers. When excited or angry, they make a distinctive clicking sound and secrete poison. They fear Basilisks.
  3. Harry Potter and the Half-Blood Prince
  4. 4.0 4.1 Harry Potter and the Chamber of Secrets
  5. Harry Potter and the Goblet of Fire
  6. J. K. Rowling's Official Site
  7. In the Chamber of Secrets, a door is about to close. You can then see an Acromantula walking towards you before the door is closed.

Study of Ancient Runes
Ancient Runes Made Easy
Professor: Bathsheda Babbling
Textbooks: Advanced Rune Translation · Ancient Runes Made Easy · Magical Hieroglyphs and Logograms · Rune Dictionary · Spellman's Syllabary
Known Runes: Acromantula · Demiguise · Ehwaz · Eihwaz · Fwooper · Graphorn · Hydra · Quintaped · Runespoor · Salamander · Unicorn · Unknown · Mark of Merlin

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