Pterinochilus murinus RCF
Usambara Baboon - complete care guide
Usambara Baboon
Temperature
24-28 °C
Target ambient range
Humidity
60-70 %
Substrate / enclosure RH
Adult DLS
11-14 cm
Average - varies per individual
Moult interval
Sling 2-5w - Juv 1.3-2.3mo
Adult 8-12mo
Adult cycle = mature females; males never moult again after maturity
About
The Usambara Baboon - the RED colour form (RCF) of Pterinochilus murinus from Tanzania's Usambara Mountains: deep red-orange setae over the classic OBT frame, arguably the prettiest form of the species everyone loves to fear. The full "Orange Bitey Thing" experience: web fortresses, teleport speed, willingness to bite without a threat posture, and medically significant venom. Also one of the easiest tarantulas on earth to breed and keep alive - £6 slings, bulletproof health, endless entertainment. Respect required; experience recommended.
Husbandry cheat sheet
- Origin
- Tanzania (Usambara Mountains)
- Habitat
- Dry acacia scrub - web fortresses
- Temperament
- Defensive
- In your collection
- 0
Growth, lifespan & conservation
- Growth rate
- Fast
- Maturity
- ♀ 18mo ♂ 12mo
- Lifespan
- ♀ 14yr ♂ 3yr
- Continent
- Africa
- UK availability
- Commonly available
Care Guide
Pterinochilus murinus RCF
Usambara Baboon - a complete husbandry sheet. Use as a starting point and adjust to your individual specimen.
What size enclosure does a Usambara Baboon Tarantula need?
Adults
30 × 25 cm footprint with 10-15 cm of substrate for the fortress foundations.
Slings & Juveniles
Small tubs with 6-8 cm of substrate and an anchor - webbing starts immediately.
To map exact floor space and substrate safety limits for your setup, use our free interactive tarantula enclosure planner.
What temperature and humidity does a Usambara Baboon Tarantula need?
Heating
The Usambara Baboons is comfortable at 24-28 °C. UK homes need supplementary warmth for much of the year; warm the room, never the tank floor.
Humidity
60-70 %: dry substrate, full water dish. East African scrub husbandry.
Ventilation
Cross-ventilation with a dry setup - the web holds the humidity it wants.
What substrate is best for a Usambara Baboon Tarantula?
Recommended Mixes
Depth
10-15 cm
Notes
Deep and dry-packed, anchoring the fortress web. Keep the dish full instead of misting.
How do you set up a Usambara Baboon Tarantula enclosure?
Décor
The Hide
Its own web tunnel fortress - deep substrate and anchor points get consumed into the architecture within weeks.
Water
Always provide a shallow water dish at the fortress edge.
Lighting
Ambient room light only.
How often should you feed a Usambara Baboon Tarantula?
Good Feeders
Long refusal worrying you? Separate premoult fasting from genuine problems with our "Is my T okay?" checker.
Is my Usambara Baboon Tarantula dying or moulting?
Pre-moult signs to look for
Refusing food for weeks is normal before a moult - a healthy Usambara Baboon Tarantula fasting is almost never an emergency in itself. Watch for slowing down and spending more time in the hide, laying a thick moult mat of web on the floor. Old World species do not flick urticating hairs, so there is no bald patch to watch - rely on fasting, lethargy and hide time instead.
On its back is MOULTING, not dying
A Usambara Baboon Tarantula lying upside down or on its side with legs curled inwards is almost certainly mid-moult. Do not touch it, do not right it, do not mist it - just remove any live prey (crickets can kill a defenceless moulter) and leave the room.
How long between moults?
For this species, expect a moult roughly every 16-32 days for spiderlings, every 40-68 days for juveniles, and every 95-150 days for sub-adults, with adult females moulting around every 8 months (up to 12 months at the extreme). Males never moult again after their ultimate (mature) moult.
After the moult: fang hardening time
The new exoskeleton stays soft, with fangs that cannot grip, for roughly 6 days in this species. Offer no food and no handling for about 7 days - feeding too early is how fresh moulters get injured. The shed exuvium is also the best sexing tool there is - see our tarantula sexing guide for what to look for.
Genuinely worried about behaviour that is not moulting? Our "Is my T okay?" triage tool walks the danger signs one by one.
What ongoing care does a Usambara Baboon Tarantula need?
🪞 Moulting
Moults inside the web fortress, often sealed in. Do not open the system; keep the water dish full and wait until it reopens with hard black fangs before feeding (about a week for adults). Adult intervals apply to mature females - males never moult after their ultimate moult.
🧹 Cleaning
Weekly: refresh the water dish and clear boluses via the web with tongs. Full cleans need a rehouse plan and steady nerves.
✋ Handling
Never - the species definition of defensive. Catch cup, lid discipline, and full attention.
What are the most common mistakes when keeping Usambara Baboon Tarantulas?
✓ What They Love
- Deep substrate - the web fortress needs foundations
- Dry-side setup with a full water dish
- Warm and stable
- Long tongs and lid discipline
- Feeding the food response - it is spectacular
✕ Common Mistakes
- Free handling - bites without warning
- Wet substrate
- Open-lid maintenance
- Underestimating the speed
Keep exploring: related care guides
More ground-dwelling species and close relatives from our full library:
Pterinochilus murinus
Orange Baboon Tarantula (OBT)
Same genus - full guide →
Pterinochilus murinus DCF
Kigoma Starburst Baboon
Same genus - full guide →
Pterinochilus murinus TCF
Kenyan Starburst Baboon
Same genus - full guide →
Pterinochilus lugardi
Tanzanian Blonde Baboon
Same genus - full guide →
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