invert
Goliath Birdeater
Theraphosa blondi
This is not a species for the same keeper who started with a Chilean rose or curly hair tarantula, both covered elsewhere on this site as calm, forgiving beginner terrestrials ā the goliath birdeater shares the basic New World terrestrial tarantula body plan but scales nearly every risk factor up considerably: greater size, denser and more potent urticating hairs, fangs that can exceed an inch in length, and a genuinely audible defensive warning behavior called stridulation, produced by rubbing bristles on the pedipalps and front legs together, that smaller beginner species rarely bother with. The common name is a historical exaggeration rather than an accurate diet description ā it traces to a 1705 engraving by naturalist Maria Sibylla Merian depicting the species eating a hummingbird, and while a goliath birdeater is large enough to occasionally take a small vertebrate opportunistically, its actual diet in the wild and in captivity is overwhelmingly large insects.
Females 15-25 years; males typically 3-6 years
10-12 inch (25-30cm) leg span at maturity ā the largest tarantula species by leg span and body mass, with adults weighing up to roughly 175 grams
Lowland rainforest floor of the northern Amazon basin ā Guyana, Suriname, French Guiana, southern Venezuela, and northern Brazil
Husbandry
- A terrestrial enclosure with floor space at least 3x leg span in length and width and low height ā this species' size makes an accidental fall from even a modest climb considerably more dangerous than for a smaller beginner terrestrial
- Source: British Tarantula Society husbandry guidance (checked 2026-07-13)
- 75-82Ā°F (24-28Ā°C) ambient, without the wider tolerance for cooler stretches that a dry-climate species like the Chilean rose allows, reflecting this species' consistently warm equatorial rainforest origin
- Source: British Tarantula Society husbandry guidance (checked 2026-07-13)
- 80-90% ambient with consistently damp (not waterlogged) substrate ā meaningfully higher than any beginner New World terrestrial on this site, and the single hardest husbandry parameter to maintain reliably for this species
- Source: British Tarantula Society husbandry guidance (checked 2026-07-13)
- Large roaches or crickets, sized up considerably from what a beginner species takes, offered roughly every 7-14 days for an adult; occasional appropriately sized rodent prey is sometimes offered to adult females by experienced keepers, though insects alone sustain the species well
- Source: British Tarantula Society husbandry guidance (checked 2026-07-13)
- Strictly solitary ā cannibalism between cohabiting tarantulas is well documented across the family, and this species' size makes a mismatched pairing considerably more dangerous to the smaller animal than with a compact beginner species
- Source: British Tarantula Society husbandry guidance (checked 2026-07-13)
- 6+ inches (15cm+) of moisture-retentive coco fiber, deep enough for this genuinely fossorial species to dig and occupy a real burrow, kept evenly damp throughout
- Source: British Tarantula Society husbandry guidance (checked 2026-07-13)
Handling
Direct handling of a goliath birdeater is not recommended even by experienced keepers, and this is one of the clearest places where its care diverges from a calmer beginner terrestrial's ā this species kicks urticating hairs readily and in far greater volume than a Chilean rose or curly hair, and those hairs are documented to cause more significant skin irritation and a genuine risk of eye or respiratory irritation if they become airborne near the keeper's face during enclosure maintenance. Before resorting to hair-kicking or a bite, a threatened goliath birdeater will typically stridulate ā an audible hissing or rasping sound produced by rubbing bristled body parts together, loud enough to be heard several feet away ā and that sound should be treated as a clear warning to back off rather than proceed. Fangs on a mature adult can exceed an inch in length, and while the venom itself is considered medically mild, comparable to a wasp sting for most people, the physical puncture wound from a bite this size is a real injury in its own right. All enclosure maintenance is done with tools ā a long catch cup, tongs for spot-cleaning ā never bare hands.
Setting up the enclosure
Sustaining 80-90% humidity reliably, without the enclosure turning stagnant or moldy, is the real technical challenge of keeping this species ā cross-ventilation paired with consistently damp (not soaked) deep substrate, rather than standing water, is how experienced keepers manage it, since poor airflow at this humidity level invites mold and bacterial growth fast. A secure, weighted or latched lid matters more here than with most terrestrial tarantulas given the animal's sheer strength and size.
Why the lighting and heating numbers matter
No UVB or specialized lighting is used for any tarantula, including this one, but this species' equatorial rainforest origin means it has far less tolerance for a cool household than a species like the Chilean rose that comes from a more seasonal, arid climate ā a consistent mid-to-high 70sĀ°F, ideally supported by a thermostat-controlled heat mat on the enclosure's side, keeps this species comfortable year-round.
Feeding in practice
This species' size supports meaningfully larger prey than a beginner terrestrial takes, and some experienced keepers occasionally offer appropriately sized rodent prey to a mature adult female, though a diet of large roaches or crickets alone is entirely sufficient and considerably simpler to source and gut-load consistently. Because of its size, a goliath birdeater's molt can take noticeably longer to complete than a smaller tarantula's, and feeding is stopped in the days leading up to and following a molt exactly as with any tarantula, just over a longer window given the animal's scale.
Common mistakes with this species
The most consequential mistake is underestimating this species based on general 'tarantulas are beginner-friendly' assumptions absorbed from smaller, calmer species ā the combination of size, defensiveness, and a genuinely difficult humidity target makes this a poor first tarantula regardless of how docile any individual specimen seems on a given day. A second is letting humidity run too low by applying husbandry habits learned from a dry-climate species, which stresses an animal this size more visibly than it would a smaller specimen. A third is performing enclosure maintenance without tools, given how much more hair this species can kick compared to a beginner terrestrial, and the real eye/respiratory irritation risk that follows.
Lifespan and what to expect
The same steep sex-based lifespan split seen across tarantulas applies here, with females reaching 15-25 years against a male's 3-6 ā a genuine multi-decade commitment for a female acquired young, on top of the greater day-to-day care demands (humidity maintenance, larger enclosure, more cautious maintenance routine) than a beginner species asks for. A keeper taking one on should plan realistically for both the extended timeline and the more advanced handling skill it requires throughout.
Temperament in more depth
Individual defensiveness varies, but this species as a whole carries a stronger reputation for readily using its full defensive repertoire ā stridulation, hair-kicking, and a bite as a last resort ā than the beginner terrestrials most keepers cut their teeth on, and that reputation is generally earned rather than exaggerated. Recognizing stridulation specifically as an audible warning, distinct from the silent bald-patch hair-kicking a Chilean rose or curly hair might show, is a skill specific to keeping this species that a beginner-only background doesn't teach.
Signs of good health
- A plump, rounded abdomen with no shriveling (dehydration risk is genuinely higher for this species given its much higher humidity requirement)
- Dense, intact hair coverage aside from an expected bald patch from recent defensive hair-kicking
- A visible, maintained burrow with normal digging and webbing activity
- Complete, successful molts, which for an animal this size can take considerably longer to finish than a smaller tarantula's
- A steady, even gait across all eight legs with no dragging or curling, and a normal feeding response given the species' size-adjusted appetite
Common problems
12 common invert problems are tracked for this species; 0 have full guides published so far.
Recommended gear for Goliath Birdeater
Equipment categories that are genuinely correct for this species' welfare needs ā see the full Gear Guide for the complete list.
Digital infrared temperature gun
Measures actual basking SURFACE temperature, not just ambient air ā a stick-on dial thermometer reads air temp, which is a poor proxy for the surface temp that drives digestion and thermoregulation.
Simple, easy-to-sanitize quarantine enclosure
A separate, minimal, easy-to-bleach-and-rinse enclosure (as opposed to the animal's permanent bioactive setup) makes a genuine multi-week quarantine period realistic ā see the Quarantine Timeline Planner tool for recommended duration.
Digital gram scale
Regular weigh-ins are one of the earliest, most objective ways to catch a developing health problem (weight loss often precedes visible lethargy) ā a cheap kitchen-grade gram scale is accurate enough for routine tracking.
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This is general educational care information, not veterinary diagnosis. For a sick or injured animal, see a qualified exotic-animal vet promptly ā especially for anything acute (not eating combined with lethargy, breathing changes, bleeding, or any sudden behavior change). Nothing on this page substitutes for an in-person exam.