Reptilia · Squamata
Hemirhagerrhis viperinaBocage, 1873
Western Bark Snake
Photograph placed in the public domain, CC0, via iNaturalist
A day-active, meat-eating lizard from the Afrotropic region, reaching 380 mm nose to tail.
Also called Viperine Rock Snake.
Reptilia › Squamata › Psammophiidae › Hemirhagerrhis
- Grows to
- 380mm
- greatest recorded
- Eats
- Carnivorous
- Active
- Diurnal
- Lives
- Arboreal, saxicolous
Longer than only 0% of all species in Psammophiidae anyone has measured.
The bar is the rank itself: its length is the share of the family this animal exceeds. The chart below is the family’s real spread, on a logarithmic scale because body length here runs from 380 to 2,500 mm. The solid rule is this animal. Every bar is a count of real species, and nothing on this figure is estimated.
What is known
33 sourced facts, each taken from a named scientific dataset. How to read these.
Cited from a dataset unless a row is marked otherwise.
Standing in the world
- Still living
- Extant
- Conservation status
- Least Concern
- Status assessed · the year the Red List last looked
- 2019
- Population trend
- Stable
The animal itself
- Limbs
- None
- Colour on the back
- Black, Brown
- Pattern on the back
- Banded, blotched
- Pupil
- Vertical slit
- Venomous
- Yes
- Fangs
- At the back of the mouth
Size
- Length snout to vent · greatest recorded
- 295mm11.5 in
- Length nose to tail · greatest recorded
- 380mm15 in
- Body mass · greatestcomputed
- 13.3g0.47 oz
300 mm total length (Feldman et al. 2016), Lobon-Rovira et al. 2022a (SVL: 270-295 mm), Marais 2022 (adults average 25-35 cm, max just under 40 cm, so I write max 380)
snakes only in this source
computed from length by a family-level allometric equation, not weighed
How it lives
- Diet
- Carnivorous
- How it hunts
- Active foraging
- Active
- Diurnal
- Where it lives
- Arboreal, saxicolous
- Habitat
- Savanna, Shrubland
- Biome
- Deserts & Xeric Shrublands
- Region
- Afrotropic
- Mainland or island
- Mainland
- Elevation · above sea level
- 34–1517m
- Range size
- 290,950km²
lizards (Marais 2022)
active (inferred from Marais 2022: found in deep rock crack, where it hunts for lizards, especially diurnal geckos at rest")
sheletering by day (Lobon-Rovira et al. 2022a), so I assumed nocturnal but Marais 2022 says diurnal
Arboreal (Gearty et al. 2021), saxicolous (Lobon-Rovira et al. 2022a, Marais 2022)
Breeding
- Reproduction
- Oviparous
- Average clutch
- 3eggs
- Clutches in a year
- 1per year
Feldman et al. 2015
Naming and history
- Suborder
- Serpentes
- Infraorder
- Alethinophidia
- Subspecies
- No
- Described by
- Bocage
- Moved to another genus · since it was first described
- Yes
- Described in
- 1873
- Type locality
- Angola
Keeping one
3 ft 10 in × 3 ft 10 in × 3 ft 10 in(118 × 118 × 118 cm)
Minimum length × width × height, for one animal. Bigger is always better.
The standard sizes ground species at 4 × 4 × 2.5 and climbing species at 4 × 2.5 × 4 times snout-vent length.
Recorded both on the ground and climbing, so this is the larger of the two rules in every dimension.
Lives on rock, so stable hard surfaces and basking ledges suit it.
Mindestanforderungen an die Haltung von Reptilien (Sachverständigengutachten), German Federal Ministry for Nutrition, Agriculture and Forestry, Animal Welfare Division, 10 January 1997. The standard states these floor areas are recommendations rather than binding limits.
From this animal’s own snout-vent length of 11.5 in (295 mm), at 4 × 4 × 4 times it, following the German federal welfare standard — how this is worked out.
No preferred body temperature has been recorded for Western Bark Snake. Rather than repeat a number from a care sheet, this page leaves it out.
Feeding
A prey item should be no wider than the space between the animal's eyes.
Widely used across reptile husbandry references. The stated reason is that the gap approximates the width of the throat, so wider prey is associated with impaction. This is established practice, not a measurement.
2kJ per day
Worked out for an animal of 13 g, the heaviest recorded for Western Bark Snake — so it is the top of the range, not a figure for a particular animal. Weigh yours and the number will be lower.
An upper estimate, not a feeding target, and not veterinary advice. The equation covers only what an animal burns staying alive, so a growing, gravid or recovering animal needs more — and it was measured on wild animals, which move far more than one in an enclosure. Body condition and a vet who knows the species are what a feeding decision should rest on. Where this comes from.
What nobody knows
These are not gaps in our research. No scientific dataset records them for this species — and saying so is information you cannot get from a reference that simply leaves a field out.
- — Length snout to vent · adult female mean
- — Length snout to vent · adult male mean
- — Length snout to vent · adult mean
- — Female length · mean, nose to tail
- — Length nose to tail · adult male mean
- — Length nose to tail · adult mean
- — Largest female · snout to vent
- — Largest male · snout to vent
- — Largest female · shell length
- — Largest male · shell length
- — Hatchling length · snout to vent
- — Hatchling length · nose to tail
- — Largest juvenile · snout to vent
- — Largest juvenile · shell length
- — Egg length
- — Egg width
- — Body mass · a typical adult
- — Body mass · adult female, mean
- — Body mass at hatching
- — Longest recorded life
- — Preferred body temperature · chosen in a laboratory gradient
- — Body temperature when active · measured in the wild
- — Eats arthropods
- — Eats vertebrates
- — Eats plant matter
- — How the young develop
- — Gestation or incubation
- — Smallest clutch recorded
- — Largest clutch recorded
- — Mean clutch · smallest reported
- — Mean clutch · largest reported
- — Clutches a year · fewest
- — Clutches a year · most
- — First breeds from · youngest recorded
- — First breeds by · oldest recorded
- — Hatchling length · smallest recorded
- — Hatchling length · largest recorded
- — Age at first breeding · female
- — Mature from · youngest recorded
- — Mature by · oldest recorded
- — Size at maturity · smallest recorded
- — Size at maturity · largest recorded
- — Body temp in the wild · lowest mean recorded
- — Body temp in the wild · highest mean recorded
- — Sex decided by
- — Red List criteria
- — Active season · shortest recorded
- — Active season · longest recorded
- — Density · lowest recorded
- — Density · highest recorded
- — Home range · largest recorded
- — Active in
Others in Psammophiidae
Take this data
Everything on this page is available as data under CC BY 4.0 — use it freely, credit it, no permission needed.
This species as JSON · the whole dataset
Cite this page
The Reptile & Amphibian Encyclopedia (2026). Hemirhagerrhis viperina. Retrieved 2026-09-08, from https://www.allanglescreatures.com/species/hemirhagerrhis-viperina
@misc{hemirhagerrhis_viperina_2026,
title = {Hemirhagerrhis viperina},
author = {{The Reptile & Amphibian Encyclopedia}},
year = {2026},
url = {https://www.allanglescreatures.com/species/hemirhagerrhis-viperina}
}Sources
- Meiri, S. (2024). SquamBase — a database of squamate (Reptilia: Squamata) traits. Global Ecology and Biogeography. Public domain (CC0).
- Oskyrko, O. et al. (2024). ReptTraits: a comprehensive dataset of ecological traits in reptiles. Scientific Data. Used under CC BY 4.0.
- Catalogue of Life (dataset 3LR), used under CC BY.