Breeding Notes
Pterinochilus chordatus
Kilimanjaroberg baboon spider
Also known as: Kilimanjaro mustard baboon, East African baboon spider
Species-specific breeding guidance, seasonal context and practical caveats for experienced keepers.
Species breeding reference
Breeding Notes
Breeding P. chordatus is very much for the experienced keeper—success takes a steady hand, careful timing, and a healthy respect for two moody spiders in close quarters. With a bit of environmental tweaking to mimic the East African wet season, patient conditioning, and lots of vigilance, it's possible to succeed, but don’t expect drama-free pairings or a sac every time. Treat all timing and climate tweaks as cautious best bets rather than hard-and-fast rules.
Wild Breeding Season
The Kilimanjaro Mustard Baboon likely has its peak breeding during or just after the rainy season in its East African habitat, when humidity is up and food is plentiful. Exact months are hard to pin down, but seasonal shifts coincide with the wet-dry cycle typical to these regions.
Wild Environmental Triggers
Heavy rainfall, increased humidity, and a flush of prey seem to encourage breeding behaviour in the wild, as with many tarantulas from seasonal climates.
Native Climate Context
Coming from East African savannah and bushland, P. chordatus are used to a clear split between wet and dry periods, with warm temperatures year-round. The brief rainy season gives them a window when moisture and prey availability spike—perfect timing for raising spiderlings.
Captive Breeding Window
Best odds for pairing tend to be in spring through early summer, aiming to mimic rising humidity and temperatures without pushing things to rainforest extremes. Try lightly upping misting for a week or two before introductions, but don't soak the whole setup. Timing isn't as critical as with some tropical species—let the female recover fully after a moult and don't rush her.
Pre-pairing Conditioning
Give both male and female a couple of good meals in the weeks before introducing them. Aim for slightly increased enclosure humidity, but no wet substrate, and steady warmth around 22–26°C. The female especially should be plump but not overstuffed, and not in pre-moult.
Male Introduction Guidance
Introduce the male at dusk or early evening when both spiders are more naturally active. Let him settle at the edge and watch for courtship. Always be prepared to separate at the first sign of aggression—P. chordatus can be especially quick to turn irritable. Never leave them unsupervised, and remove the male if he loses interest or gets too bold.
Female Readiness Signs
A receptive female will web actively near her burrow entrance and may linger outside more than usual. Be cautious if you notice defensive posturing or outright striking—this often means she isn't ready or interested.
Post-pairing Conditions
After pairing, return the female to a calm, undisturbed setup at that comfortable warm end (22–26°C) with the humidity levels similar to pre-pairing. Feed her well and avoid further disturbance. A slight increase in humidity (again, without drenching) may help, but stability is key.
Sac Timeline
If successful, an eggsac may appear four to eight weeks after pairing. There’s no set rule—timing can fluctuate depending on the individual and environmental factors. Females show classic brood behaviour, remaining near their burrow and rarely venturing out until the sac emerges.
Incubation Notes
Leave the sac with the female if possible—removal is always a risk unless there’s strong reason. Incubation usually runs six to eight weeks at warm room temperatures. If you must artificial incubate, keep conditions steady and don’t over-humidify.
Expected Sling Count
Clutch sizes in P. chordatus appear variable, but you can expect anywhere from 100 to possibly 300 spiderlings in a healthy sac. Counts can be lower if the female is smaller or conditions were less than ideal.
Risks and Cautions
This species is not a forgiving breeder. Aggression is high, especially from the female, and males are often at risk—never turn your back. Mating success isn't guaranteed, even under good conditions, and failed sacs are not uncommon. Beginners should not attempt this pairing.
Evidence confidence: Medium
