Mount Rungwe Bush Viper

🔤 Taxonomy

Atheris rungweensis is a species distinct from A. nitschei. The former name Atheris nitschei rungweensis remains useful when checking older literature and origin papers. Published differences include head scalation and colour pattern; avoid reassigning an undocumented animal from a photograph alone.

📌 Description

A green to dark bush viper, often with yellow markings, approximately 40–65 cm for adult planning. It climbs shrubs but also appears near the ground at forest edges. Its broader elevational range means the species name alone does not justify a single cold-night programme; recorded locality is useful husbandry information.

The Atheris squamigera guide offers a comparison for perching, ventilation and hydration. The provisional numerical targets here are adjusted to this species’ documented habitat; they are not a tested species-specific protocol or measured tolerance limits. Broadley’s review supports the natural-history rationale, not validation of these terrarium values. Enclosure sizes are practical recommendations. Reliable species-specific lifespan and maturity schedules are lacking; retain age, growth and health records instead of promising a fixed lifespan.

📋 Quick reference

Care point	Provisional active-season target
Adult length	40–65 cm
One adult enclosure	75 × 60 × 90 cm
Ambient air	20–25°C
Basking surface	26–28°C
Cool retreat	18–22°C
Night air	16–20°C
Relative humidity	65–85%

🌍 Distribution

Native to Tanzania, northeastern Zambia and northern Malawi. Published records include montane forest margins, streamside bushes and sites around 800–2000 m. The Rungwe slope point at about 1921 m represents an upland sector, not all lower-elevation populations. Country shading is broad context and not an occupied-range polygon.

Native-range context: country shading is not occupied habitat

🌡 Climate across the native range

Reference period: 1991–2020. Outdoor normals for representative habitat terrain, not verified snake observations or terrarium settings.

Mount Rungwe slopes — Tanzania

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Month	Min °C	Mean °C	Max °C	RH %
January	14.6	17.8	22.1	85
February	14.6	17.8	22.3	84
March	14.6	17.4	21.8	87
April	13.9	16.4	20.4	89
May	12.2	15.2	19.6	85
June	9.9	13.4	18.3	82
July	9	12.8	18	80
August	10	14.4	20.2	74
September	11.6	16.6	22.7	67
October	13.3	18	23.6	69
November	14	18.1	23.2	76
December	14.5	17.8	22.3	83

Weather data by Open-Meteo.com · CC BY 4.0 · Monthly normals calculated by Herpeton Academy from daily archive values.

⚖️ Legal status

Checked 17 September 2026: the reviewed official CITES Appendices and EU wildlife-trade annexes do not list this species. Bern is not relevant to its native African range. Non-listing does not authorize capture, export or ownership: check national wildlife controls in the country of origin and local rules at the destination for dangerous animals, import, registration, breeding, transport and sale. Retain breeder identity, invoice, parentage and any export/import documents.

☠️ Venom

Direct species-specific clinical evidence is limited. The warning here uses Atheris evidence cautiously; it does not claim that rungweensis was tested in the cited 2022 comparison.

A bite is a medical emergency. Severity varies between bites. Pain, swelling, tissue injury and serious clotting disturbance or bleeding are possible; a small snake or an apparently dry bite is not reassuring. No Atheris-specific antivenom was identified in the reviewed clinical literature. Products for other vipers cannot be assumed effective.

Move away, call emergency services, remove tight items, keep the patient still and support the limb without compression. Do not cut, suck, ice or tourniquet the wound, or delay transport to capture the snake. Agree a receiving hospital and poison-centre pathway before acquisition; treatment decisions belong to those clinicians.

🤌 Husbandry

Keep one animal per locked enclosure inside a locked, access-controlled room with secondary containment. Use a shift compartment that permits isolation and visual confirmation before servicing; never free-handle. Written bite and escape plans, trained backup staff and a reptile veterinarian are prerequisites.

Quarantine separately for at least 90 days as a working minimum, extending it on veterinary advice. Use paper substrate and dedicated tools; record meals, weight or body condition, stools and sheds. Arrange parasite screening for uncertain origin, weight loss or abnormal faeces. Any examination or weighing must use an established protected-contact procedure.

💡 Lighting

Use a timer for 11–13 hours of visible light and a dark night, with shaded resting sites available throughout. No precise species-specific UVB requirement was verified. If low-level UVB is used, measure exposure, retain opaque cover and have the arrangement reviewed by the collection veterinarian; lamp output is not interchangeable with a UVI measured at the perch.

🌡 Heating and temperature

For an upland-source animal, make the warm branch a small part of a shaded, ventilated climbing network. Lower-elevation origin may justify a different seasonal plan, so obtain the previous keeper’s measured conditions. Do not lower nights merely to match the coldest month in the Rungwe outdoor table.

Thermostat-control and guard every heat source. Measure air and perch surfaces separately, including the coolest usable perch. Test the room through summer: a thermostat cannot cool it. These tropical vipers have no routine cold-brumation instruction here. Any breeding-season change must follow a documented locality-specific protocol for healthy established adults, never automatic cooling of juveniles, gravid, thin, sick or newly arrived animals.

💧 Humidity and water

Treat the humidity band as a provisional daily management range, allowing rises after misting and drying between cycles. Briefly wet selected leaves to offer droplets, while also providing a stable clean water bowl. Observe drinking from outside the enclosure; do not assume a bowl alone or constant spraying guarantees hydration.

Ventilate across the enclosure and leave dry perches available. Persistent condensation or wet belly scales calls for a drainage and airflow review, not more heat everywhere. Never force soaking or peel retained skin; recurrent shedding difficulty needs veterinary assessment.

🌿 Enclosure and decoration

Combine low and middle-height branches with a sheltered floor route and leafy resting pockets. Streamside ecology supports access to drinking droplets and ventilation, not a waterfall that keeps every support wet. Keep drainage accessible after isolating the snake, so a hidden sump cannot become a persistent hygiene problem.

After quarantine, about 5–8 cm of fertiliser-free soil mixed with fine bark or coir can buffer moisture above a drainable base. Keep the resting surface clean rather than saturated; paper remains useful for juveniles and observation. Avoid sharp gravel, dusty sand and aromatic wood. Keep prey free of substrate: swallowed particles, dehydration and oversized meals can contribute to impaction. Anchor all branches independently of loose soil and check for neonatal escape gaps.

🐁 Feeding

Frogs are documented in the natural diet, and published data are too sparse to assume every animal readily takes rodents. Obtain a proven feeding history and reliable prey supply before transfer. An established mouse-feeding adult can start with small thawed whole meals every 14–21 days; juveniles may need smaller meals every 7–10 days. Any prey transition needs an experienced collection plan, not force-feeding by the new keeper.

For vertebrate prey, start no wider than the snake’s widest body section; whole prey normally needs no routine vitamin or calcium dusting. Avoid live rodents and feeding disturbance. Never attempt force-feeding at home. Persistent refusal with weight loss, regurgitation or mouth discharge needs diagnosis rather than progressively larger meals.

🥚 Breeding

This is a live-bearing species; there is no egg-incubation schedule. Males often have relatively longer tails, but visual clues are not sufficient for a breeding decision: have sex confirmed through a professional protected procedure. Reliable universal maturity ages are not established; use documented age, adult size, body condition and the source institution’s records.

Pair only healthy mature animals of compatible documented locality under a specialist plan. Gestation and recovery can be costly for small females, so do not assume annual breeding is appropriate. Prepare separate locked neonatal housing, feeding expertise and lawful placements before pairing. Keep records of parentage, births, sheds and first meals.

🩺 Common problems

Overheating: unusual exposed resting or repeated escape attempts warrant immediate checks of the cool hide and room.
Respiratory infection: bubbles, wheezing or open-mouth breathing need prompt reptile-veterinary assessment.
Dysecdysis, dehydration and dermatitis: check water access, refuge moisture and wet dirty substrate; do not manually strip skin.
Obesity, impaction or parasites: track meals, stools and body condition; persistent change needs diagnosis.
Reproductive problems: prolonged abnormal swelling, weakness or unsuccessful birth requires urgent veterinary advice.

📌 Conclusion

Keep locality and feeding history with the animal: both are more informative than transferring a nitschei routine wholesale. Drainage and reachable service points should be demonstrated before the enclosure is occupied.

📚 Sources and further reading

ReptiFiles was searched first on 17 September 2026; no species-specific guide was found. Distribution and taxonomic references establish natural-history context, not tested terrarium targets. The official keeping guidance supports containment; numerical care values are explicitly provisional. Venom studies support caution, not an antivenom recommendation.