Heterometrus spp.
Identity confidence: provisional. This is a genus, group, or trade name rather than a confirmed species. Treat it as the closest match we can stand behind, and use the more conservative end of any range.
Asian Forest Scorpions: Advanced Care Guide
Keeper Snapshot: Large humid forest scorpions with strong claws and defensive behavior: sizes vary widely by species (H. swammerdami is a giant, body to ~9 in).
Group: Industry StaplesDifficulty: Spice 2-3: Beginner / IntermediateSetup: Tropical burrowing terrestrialHandling: Not recommended
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 | 75-85°F |
|---|---|
| Humidity | High ambient (70-80%) with cross ventilation; damp deep substrate, drier surface |
| Setup Type | Tropical burrowing terrestrial |
| Substrate | Deep moist substrate |
| Feeding | Weekly |
| Care Difficulty | Spice 2-3: Beginner / Intermediate |
| Handling | Not recommended |
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
- Baby Buddy: secure starter enclosure for 2i-3i instars (escape-proof ventilation only)
- Burrow Buddy: grow-out burrow setup for juveniles
- Larger tropical terrestrial setup for full-grown adults
Warnings First
- Defensive pinch/sting
- Humidity needed
- Communal only with space, food, and monitoring
- Not a handling pet
- High humidity without cross ventilation is the main killer for this genus. Damp plus still air grows mold and mycosis; damp plus moving air is exactly what an Asian forest scorpion wants.
Simple Care
- Moist substrate.
- Cross ventilation low on two opposite walls. High humidity is only safe when the air is moving.
- Hide and water dish. Put pebbles in the dish so scorplings cannot drown.
- If kept communally, use deep substrate, multiple hides, similar sizes, and watch molt/feeding timing.
- Strong claws.
Advanced Keeper Notes
Enclosure & Microclimate
- Use deep moist substrate that holds burrows and humidity.
- Avoid drying out, but provide enough ventilation to prevent stagnant mold.
- Make that ventilation cross ventilation at substrate level: vents low on two opposite walls, at or just above the substrate line, so air travels horizontally through the burrow and leaf litter layer. That is the layer a Heterometrus actually lives in and the first place a humid enclosure goes stagnant. Venting only through the lid dries the surface while saturated air sits motionless down in the burrow, which is where mold blooms and cuticle fungus start.
- Ventilation and ambient humidity are one system with a built-in trade. Hold 70 to 80% by keeping the deep substrate damp and running a full water dish, with air moving freely above it, rather than by restricting vents. A sealed enclosure gives a perfect hygrometer reading and a mold problem.
- Read the substrate with your hands rather than the gauge. The bottom third should clump and hold its shape when squeezed with no water running out, the middle cool and damp, the surface allowed to look drier. That vertical gradient is what the scorpion burrows through to pick its own conditions.
- Keep a proper water dish and put pebbles or flat stones in it so the waterline sits below the rim. This genus is often kept communally and produces large broods, and scorplings drown in open dishes. Rinse and refill a couple of times a week since Heterometrus will foul a dish.
- Mist under the hides and into the leaf litter rather than spraying the whole enclosure. That keeps the humid pocket where the animals actually shelter while the open surface and the air above it stay free to move. A uniform wet-down is what turns a healthy communal setup moldy.
Feeding, Growth & Maintenance
- Feeding: crickets, dubia roaches, the occasional superworm. Prey up to about body length, smaller for juveniles. Juveniles feed heavily every ~5-7 days; adults every 1-2 weeks and will fast for a month happily. Don't power-feed adults into obesity, and remove uneaten feeders before a molt.
- Growth: roughly 7 molts over several years to full size; lifespan ~7-8 years. As a live-bearer, the mother carries white first-instar young on her back until their first molt. Feed her small, non-aggressive prey and don't disturb her. Communal groups can work with deep substrate, plenty of space and heavy feeding, but cannibalism still happens around molts and size mismatch, so it's experienced-keeper-optional, not a guarantee.
- Maintenance: remove boluses, uneaten feeders and mold; keep the water dish clean. Substrate stays moist enough to hold a burrow but never waterlogged: chronic over-wetness is the usual killer, and wild-caught stock often carries mites, so quarantine new arrivals. Spot-clean rather than tearing down an established burrow, and log observations so you change conditions one at a time.
Possible Origin / Range
- Likely native range: South and Southeast Asian humid forest regions including India, Sri Lanka, Thailand, Malaysia, or Indonesia depending on species.
- Habitat translation: Deep moist substrate, cork retreats, water access, and ventilation.
Advanced Keeper Details
- Species IDs in this genus are often messy; avoid exact locality claims without supplier data.
- Humid does not mean sealed. Stagnant substrate causes mold, mites, and poor molts.
- The trade 'H. spinifer' is usually H. petersii; H. swammerdami is the genuine giant (body to ~9 in). Slightly more defensive than an emperor and quicker to pinch or sting, but venom is mild.