Theraphosa blondi
Goliath Birdeater Tarantula: Advanced Care Guide
Keeper Snapshot: A giant terrestrial/fossorial tarantula for advanced keepers. It needs space and humidity. 9-11 inches across (body to ~5 in), among the largest spiders on earth.
Group: TarantulasDifficulty: Spice 4: AdvancedSetup: Large humid terrestrial/fossorialHandling: NEVER
Use This Guide Safely
- Confirm the exact animal. Match this guide to the species, locality, size, and life stage on your label. If the ID is uncertain, use the more conservative part of the range and ask before changing the setup.
- Change one thing at a time. Treat temperature and humidity as target zones, then watch posture, burrowing, drinking, feeding, and molt behavior before making another adjustment.
- Respect the handling boundary. If the guide says no handling, fast, defensive, or medically significant, plan transfers with catch cups, locked lids, and no bare hands. For serious bites, stings, or symptoms, seek emergency medical care.
Quick Snapshot
| Temperature | 75-82°F |
|---|---|
| Humidity | High ambient (75-85%) with cross ventilation; damp deep substrate, drier surface, large dish |
| Setup Type | Large humid terrestrial/fossorial |
| Substrate | Deep moist soil/coco mix |
| Feeding | Large prey weekly or as body condition requires |
| Care Difficulty | Spice 4: Advanced |
| Handling | NEVER |
Humidity zones: Very Low under 30% - Low 30-60% - Low-Moderate 40-70% - Moderate 60-80% - Moderate-High 70-85% - High 80%+ - Very High 90%+
Enclosure Format / Size Class
- Compact secure enclosure for tiny slings (briefly)
- Horizontal humid terrestrial/fossorial burrow setup for juveniles
- Large deep-substrate humid burrow build for the adult
Warnings First
- Massive adult size
- High humidity needs
- Heavy urticating hairs and defensive potential
- High humidity plus a large still enclosure is how Theraphosa setups rot. Cross ventilation low on two opposite walls is what separates stable humidity from stagnant humidity.
Simple Care
- Do not let the substrate dry out.
- Cross ventilation low on two opposite walls. On this species airflow is what makes high humidity safe.
- Give deep substrate and a large water dish. Put pebbles in it so slings cannot drown.
- Plan ahead for a large adult enclosure: roughly a 20-gallon long, or an 18×12×12 in (or larger) floor-space build.
Advanced Keeper Notes
Enclosure & Microclimate
- Theraphosa need stable humidity without stagnant rot. Use deep moisture-holding substrate, ventilation, and a large water dish.
- They may burrow, bulldoze, and stress easily from exposure. Provide cork, cover, and room to retreat.
- 'Stable humidity without stagnant rot' is the single hardest balance in the hobby, and vent placement is how you win it. Put vents low on two opposite walls, at or just above the substrate, so air moves horizontally through the deep damp layer where this spider burrows. On a 20-gallon-long footprint, lid-only venting leaves the far corners of the floor motionless, and those corners are exactly where a deep wet substrate goes sour. Scale the vent count to the footprint rather than reusing a small-enclosure design.
- Ventilation and ambient humidity pull hard against each other here, and on this species you need both high. Hold 75 to 85% by keeping the deep substrate genuinely damp and running a large dish, with air moving freely above it. Never hold humidity by restricting vents. A sealed Theraphosa enclosure gives a perfect hygrometer reading and a substrate that rots.
- Read the substrate with your hands rather than the gauge. The bottom third should clump and hold when squeezed with no water running out, the middle cool and damp, the top allowed to look drier. That vertical gradient is what the spider burrows through, and it matters more than any single ambient number.
- Keep a large water dish and put pebbles or flat stones in it so the waterline sits below the rim. Theraphosa slings are large as slings go but still drown, and keepers of this species tend to jump to a big dish early because the adult will need one. Rinse and refill often, since a heavy feeder in a humid enclosure fouls water fast.
- Mist under the cork and into the burrow entrance rather than soaking the whole surface. That keeps the humid pocket where the spider actually shelters and leaves the open floor able to dry and re-air between waterings, which is the practical difference between stable and stagnant.
Feeding, Growth & Maintenance
- Feeding should match body condition. These are large animals but still need fasting respected during premolt.
- Feeding schedule: slings 2×/week (fast growers); juveniles weekly; adult females large prey every 1-2 weeks, or as body condition requires. Keep prey smaller than the abdomen.
- Molting: even a giant turns sluggish, hides, and stops eating for days or even weeks before a molt. Normal. Pull uneaten feeders, leave it strictly alone, and wait 5-10 days after the molt (until the new fangs and exoskeleton harden) before feeding again.
- This is not a beginner giant. Plan the adult enclosure before you buy.
Possible Origin / Range
- Likely native range: Northern South America rainforest regions, including Guyana, Suriname, French Guiana, Brazil, or Venezuela region.
- Habitat translation: Deep moisture-holding substrate, high humidity, and airflow; wet-stale conditions are not acceptable.
Advanced Keeper Details
- Adults need large, stable retreats and floor space. Do not design for handling or frequent disturbance.
- Track substrate hydration by lower-layer moisture and ventilation quality, not just surface misting.
- Adult size 9-11 in DLS (body to ~5 in); among the largest spiders in the world; fast-growing as slings; females ~15-25 years, males ~3-6. The Type-III urticating-hair load is one of the worst in the hobby: keepers routinely wear gloves, eye protection, and a dust mask during maintenance.