Grammostola pulchra
Brazilian Black Tarantula: Advanced Care Guide
Keeper Snapshot: A calm, slow-growing terrestrial tarantula and one of the best premium beginner species. Adults reach about 6-7 inches across, and females are famously long-lived: 20-30+ years (males roughly 5-8).
Group: TarantulasDifficulty: Spice 2: BeginnerSetup: TerrestrialHandling: Discouraged
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 | 70-80°F |
|---|---|
| Humidity | Moderate ambient (60-75%) with steady airflow; damp lower corner, drier surface, full dish |
| Setup Type | Terrestrial |
| Substrate | Dry soil/coco mix, 2-4 in for juveniles/adults |
| Feeding | Slings weekly; adults every 1-2 weeks |
| Care Difficulty | Spice 2: Beginner |
| Handling | Discouraged |
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 while it's a tiny sling
- Horizontal terrestrial burrow setup for juveniles
- Larger floor-space terrestrial build for the adult
Warnings First
- Avoid falls
- Long fasts are normal
- Slow growth
- A slow-growing species spends years as a small spiderling. Keep pebbles in the water dish that whole time so a sling cannot drown in it.
Simple Care
- Keep a damp corner and a full water dish; the rest can stay on the drier side.
- Put pebbles in the dish so slings cannot drown.
- Steady airflow. A damp corner in a still enclosure grows mold instead of helping the spider.
- Give a hide and floor space.
- Temperament: docile. One of the calmest tarantulas in the hobby (calm still isn't a handling pet).
- Do not stress over occasional fasting.
Advanced Keeper Notes
Enclosure & Microclimate
- Keep the substrate barely damp at the bottom with a full water dish; overflowing the dish occasionally gives a moisture zone without soaking the enclosure.
- Keep the enclosure low. A heavy-bodied terrestrial gets hurt in a fall.
- A terrestrial burrow setup suits this genus and keeps the spider in view.
- That overflow-corner method only works if air is moving. Vents low on two opposite walls, at or just above the substrate, keep air crossing the floor so the damp corner stays a local feature rather than spreading until the whole enclosure sits mildly clammy. A low terrestrial enclosure vented only in the lid has very little air movement down at substrate level, which is where both the spider and the damp corner are.
- Ventilation and ambient humidity trade against each other, and the overflow method is how you resolve it. Rather than raising humidity by closing the enclosure up, you feed a little moisture in at one corner and let good airflow carry it across. Ambient lands somewhere around 60 to 75% and it does not matter if it drifts, because the spider drinks from the dish.
- Judge substrate by hand rather than by a gauge. The damp corner should hold shape when squeezed with no free water and dry back over several days; the rest of the surface should read dry. If nothing ever dries out, add ventilation instead of cutting the overflow.
- Keep the dish full and put pebbles or coarse grit in it so the waterline sits below the rim. This species grows slowly enough that it stays sling-sized for a long stretch, and a sling drowning in an over-deep dish is a common and entirely preventable loss. The stones also give feeders something to climb out on instead of fouling the water.
- Mist the substrate under or behind the cork hide rather than across the enclosure. That keeps a humid pocket in the burrow the spider actually occupies while the open floor stays dry and the air keeps moving.
Feeding, Growth & Maintenance
- Grammostola are slow-metabolism tarantulas. Refusing food for weeks or months can be normal when body condition is healthy.
- Feeding schedule: slings 2×/week; juveniles every 7-10 days; adults every 2-3 weeks. Keep each prey item smaller than the spider's abdomen.
- Read body condition, not the calendar: if the abdomen is narrower than the widest part of the carapace, feed more often; if it's plump and round, back the frequency off.
- Molting: a Brazilian Black going into a molt turns sluggish, tucks away, and stops eating for days or even weeks. That is normal. Pull any uneaten feeders, leave it alone, and wait 5-10 days after the molt (until the new fangs and exoskeleton harden) before offering food again.
Possible Origin / Range
- Likely native range: Brazil, Uruguay, and Paraguay region in seasonally dry grassland or scrub; captive labels can be taxonomically messy.
- Habitat translation: Dry terrestrial setup with water access and limited fall height.
Advanced Keeper Details
- Slow growth and long fasts are normal; monitor abdomen condition rather than feeding schedule anxiety.
- Keep substrate deep enough to cushion and shallow enough that falls are not dangerous.
- Adult size ~6-7 in DLS; very long-lived: females 20-30+ years, males ~5-8. Growth is slow at room temperature, but the well-documented 'pulchra myth' is that it is always slow: kept consistently warm (low-to-mid-80s °F) with regular feeding, growth speeds up dramatically.