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Goliath Birdeater
Theraphosa blondi
The heaviest, most massive, and largest-bodied spider on the planet (literally the size of a dinner plate). The Goliath Birdeater flaunts brutal one-inch (2.5 cm) fangs and a highly intolerant temperament, cunningly ready to bombard your lungs and eyes with the most dangerous, effective urticating hairs in the animal kingdom. It requires terrifyingly perfect, heavily ventilated swamp-like equatorial conditions to avoid fatal desiccation during its massive molts.
Class:Arachnida
Order:Araneae
Family:Theraphosidae
Subfamily:Theraphosinae
Genus:Theraphosa
Species:Theraphosa blondi
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Environment
Terrestrial
Humidity
75 - 85 %
Day temperature
24 - 28 °C
Night temperature
20 - 24 °C
UVB
None
Species description
Geographical Origin and Habitat: The pitch-black, eternally wet, and primordial forest floor of the great unspoiled rainforests of Venezuela, northern Brazil, Suriname, and French Guiana. It lives deeply entrenched inside dark, muddy burrows abandoned by rodents dug into clay hillsides or hidden tightly under massive, rotting, ancient fallen logs in the deeply shaded jungle interior.
Taxonomy and Genetics: Theraphosidae family. It belongs to the giant 'New World' (South American) group. While the Laotian Giant Huntsman spider (Heteropoda maxima) holds the world record for sheer 'leg span' (having long thin legs on a tiny body), the Theraphosa blondi holds the absolute undisputed world record for crushing body mass, abdominal girth, and formidable weight, possessing a massive carapace easily wider than a grown man's palm.
Behavior and Habits: Extremely nervous and highly defensive. Because they are so insanely massive and heavy, they do not sprint or run fast; instead, they strike at close range or barricade themselves defensively. They are primarily famous for the incredibly loud warning friction noise (Stridulation) they produce by rubbing specialized serrated bristles near their massive fangs before striking: a sinister, threatening noise perfectly identical to an angry rattlesnake's rattle or velcro being violently ripped apart. If you approach them recklessly, they will turn around and forcefully kick explosive clouds of deadly abdominal hairs into the air with their hind legs.
Morphology: Monstrous, logic-defying sizes for an arthropod. They easily exceed 11-12 inches (28-30 cm) in leg-span and can weigh over 6 ounces (175 grams - about the weight of a young puppy or a large smartphone). Their coloration is a monotonous, deep mahogany brown or dense, velvet blackish-brown. They are armed with arched, pure-ebony fangs almost an inch long (2.5 cm) capable of crushing the tiny skulls of small animals. Females live incredibly long (up to 25 years) and as they age they drop their hairs, suffering from abdominal baldness (alopecia). Males are smaller with incredibly long, spindly legs and shriveled abdomens, developing curved tibial hooks to hold back the female's fangs during mating, and dying shortly after their terminal molt.
Care, breeding and tankmates
Terrarium Setup: A NIGHTMARE FOR SPACE. Being strictly heavy terrestrial bulldozers, they do not climb, but smooth glass walls must be sealed shut (if they climb and fall even a few inches, their absurdly heavy, water-balloon-like abdomen will rupture upon hitting the floor, causing them to bleed to death rapidly from hemolymph loss). They require very large, wide, low-ceiling terrariums (e.g. 24x18x12 inches / 60x45x30 cm). It is strictly mandatory to use 6-8 inches (15-20 cm) or more of extremely wet fibrous peat moss (never toxic pine or cedar), heavily mixed with thick wedges of sphagnum moss, forming a cavern of massive cork bark deeply embedded into the swampy floor.
Lighting and Heating: Equatorial animals demanding absolute shade. They desire zero light other than the dim natural solar cycle of a shaded room. They require a stable, dedicated temperature-controlled room without drafts or sharp drops (75-80°F / 24-27°C is ideal), as temperatures rising above 85°F (29-30°C) combined with high humidity and stagnant air will turn the tank into a suffocating, lethal steam room, toxifying the massive animal and forcing it deep underground to slowly die.
Humidity and Hydration: THE SUPREME AND EXASPERATING CHALLENGE (THE SWAMP MONSTER). This spider will only thrive and survive in a perpetually SOAKING WET environment (80-90% constant humidity). However, the water must deeply permeate the lower soil layers through a flooded corner pipe (Overflow dish technique) while the air in the terrarium MUST ABSOLUTELY CIRCULATE FREELY VIA MASSIVE CROSS-VENTILATION WITH HUGE MESH VENTS. Extreme humidity + Stagnant, dead, enclosed air = within 3 days, lethal grey mold and white fungal rot will coat the spider's fuzzy legs, causing necrotic gangrene and a horrible death.
Feeding and Supplementation: EXPENSIVE GRINDERS. The nickname 'Birdeater' was coined by 18th-century explorers who allegedly found them sinking their fangs into hummingbirds on the forest floor, but in reality, they devour giant toads, massive South American earthworms, and small snakes. In captivity, they demand titanic prey: you must feed them heavily using the absolute largest adult locusts available, dozens of adult Dubia roaches, and avalanches of giant superworms fed via long tongs. They will happily take small rodents (fuzzy/hopper mice), but strictly rarely, as vertebrate prey leaves behind massive amounts of rotting, foul-smelling carnage that will instantly mold and toxify the enclosure.
Compatibility: An animal that must be housed totally, strictly, and absolutely alone. To breed the Theraphosa, you must introduce an adult male into the female's massive box, preparing to lose him horrifically torn apart between the gigantic fangs of his mate even before the rhythmic, vibrating amplexus begins, or right after the terrifying, thunderous mating drums the titanic female beats into the dirt (which literally break the silence of the night, sounding like heavy, repeated thuds against the ground).
Health and Common Diseases: TYPE III URTICATING HAIRS AND MOLT MORTALITY: This tarantula kicks off hairs from its abdomen that look like fine dust but are microscopic, barbed harpoons made of pure fiberglass (Type III urticating setae). If irritated, it sweeps its hind legs, brushing them into the room's air. If inhaled deeply into human lungs, they cause fulminant bronchospasms and coughing fits; if flicked into the eyes, they will embed into the cornea, causing severe corneal scratches requiring emergency room treatment. Terrifying Molt Mortality (Bad Molt): If the substrate, due to a keeper error, drops even slightly below 85% humidity during its gigantic, exhausting molting process, this 11-inch beast will get permanently stuck halfway out of its old exoskeleton, dying a slow, agonizingly suffocating death while severely cramped.
Geographic Origin and Distribution
The pitch-black, eternally wet, and primordial forest floor of the great unspoiled rainforests of Venezuela, northern Brazil, Suriname, and French Guiana. It lives deeply entrenched inside dark, muddy burrows abandoned by rodents dug into clay hillsides or hidden tightly under massive, rotting, ancient fallen logs in the deeply shaded jungle interior.
Origin
Amazon, Orinoco, and GuianasCentral America and CaribbeanEast Asia
Terrestrial invertebrate profile
- Diet
- No verified data available
- Life expectancy
- No verified data available
- Adult size
- 30 cm
- Lifestyle/Microhabitat
- No verified data available
- Activity cycle
- No verified data available
- Sociality
- No verified data available
- Reproduction
- No verified data available
- Venom level
- No verified data available
- Handling tolerance
- No verified data available
- Brumation
- No verified data available
- Molting
- No verified data available
The catalog's scalar value is 30 cm. The Herpeton Academy — Theraphosa blondi source reports a maximum adult measurement of 30 cm for this species, recorded as diagonal leg span (DLS). The taxonomic record consulted is Theraphosa blondi. These figures are not interchangeable: the first is the profile's editorial reference, whereas the second is a published maximum under a specific measurement convention; differences among sources can reflect sex, population, life stage and measuring method.
Image gallery
Licensed images linked to the species or, when marked, to the closest representative taxon.
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