Reptilia · Squamata
Atractus zebrinusJan, 1862
Photograph by Giovanna Roque de Castro, CC BY-SA, via iNaturalist
A nocturnal, meat-eating snake from the Neotropic region, reaching 649 mm nose to tail.
No English name has been recorded for this species.
Reptilia › Squamata › Colubridae › Atractus
- Grows to
- 649mm
- greatest recorded
- Eats
- Carnivorous
- Active
- Nocturnal
- Lives
- Fossorial, terrestrial
Longer than only 48% of all colubrid snakes 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 98 to 3,800 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
34 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
- 2014
The animal itself
- Limbs
- None
- Pupil
- Round
- Fangs
- At the back of the mouth
Size
- Length snout to vent · greatest recorded
- 621mm2 ft
- Length nose to tail · greatest recorded
- 649mm2 ft 2 in
- Hatchling length · snout to vent
- 140mm5.5 in
- Hatchling length · nose to tail
- 150mm6 in
- Body mass · greatestcomputed
- 76.19g2.7 oz
- Body mass · adult female, meanmeasured
- 3.5g0.12 oz
- Body mass at hatchingmeasured
- 3g0.11 oz
649 mm total length (Feldman et al. 2016), Siqueira et al. 2022 (male SVL 386 ± 58, range 315-487, n = 13; female SVL 463 ± 55, range 423-621, n = 14, min female tali length is 31 mm so total length of the largest must be >650, embryo close to hatching: 140 mm SVL, 10 mm tail, weight 3 g), 1 (Diaz-Ricaurte et al. 2022; female 191 mm, 3.5 g)
computed from length by a family-level allometric equation, not weighed
How it lives
- Dietcomputed
- Carnivorous
- Active
- Nocturnal
- Where it lives
- Fossorial, terrestrial
- Habitat
- Forest
- Biome
- Tropical & Subtropical Moist Broadleaf Forests
- Active season · months of the year
- 12months
- Region
- Neotropic
- Mainland or island
- Mainland
- Elevation · above sea level
- 440–1030m
- Range size
- 326,394km²
no actual data but can be imputed as carnivorous like all snakes
"probably nocturnal" (Siqueira et al. 2022)
"fossorial (leaf litter, termite mounds), > 50% digging" (Gearty et al. 2021), semifossorial (Siqueira et al. 2022)
440-1029 (Siqueira et al. 2022)
Breeding
- Reproduction
- Oviparous
- Average clutch
- 7
- Eggs or young per clutch
- 3–11eggs
- Mean clutch
- 6eggs
Feldman et al. 2015
midpoint of the reported range — Meiri, 2024, Glob. Ecol. Biogeogr., 33:e13812
"Clutch size averaged 6 ± 3 eggs/vitellogenic follicles (range = 3-11, N = 8)" (Siqueira et al. 2022)
Naming and history
- Suborder
- Serpentes
- Infraorder
- Alethinophidia
- Subspecies
- No
- Described by
- Jan
- Moved to another genus · since it was first described
- Yes
- Described in
- 1862
- Type locality
- Brazil
Keeping one
2 ft 2 in × 13 in × 19 in(65 × 33 × 49 cm)
Minimum length × width × height, for one animal. Bigger is always better. Substrate at least 13 in (33 cm) deep.
The standard sizes snakes as a fraction of total length: 1 × 0.5 × 0.75.
Burrows, so substrate deep enough to dig in matters as much as floor area.
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 total length of 2 ft 2 in (649 mm), at 1 × 0.5 × 0.75 times it, following the German federal welfare standard — how this is worked out.
No preferred body temperature has been recorded for Atractus zebrinus. Rather than repeat a number from a care sheet, this page leaves it out.
Feeding
A prey item should be between the same width as the widest part of the snake's body and about 1.5 times that width.
Widely used across snake husbandry references. An alternative formulation gives prey at 10-15% of the snake's body mass. This is established practice, not a measurement.
9kJ per day
Worked out for an animal of 76 g, the heaviest recorded for Atractus zebrinus — 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
- — Largest juvenile · snout to vent
- — Largest juvenile · shell length
- — Egg length
- — Egg width
- — Body mass · a typical adult
- — 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 it hunts
- — How the young develop
- — Gestation or incubation
- — Clutches in a year
- — 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
- — Venomous
- — Body temp in the wild · lowest mean recorded
- — Body temp in the wild · highest mean recorded
- — Colour on the back
- — Pattern on the back
- — Sex decided by
- — Population trend
- — Red List criteria
- — Density · lowest recorded
- — Density · highest recorded
- — Home range · largest recorded
- — Active in
Others in Colubridae
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). Atractus zebrinus. Retrieved 2026-09-08, from https://www.allanglescreatures.com/species/atractus-zebrinus
@misc{atractus_zebrinus_2026,
title = {Atractus zebrinus},
author = {{The Reptile & Amphibian Encyclopedia}},
year = {2026},
url = {https://www.allanglescreatures.com/species/atractus-zebrinus}
}Sources
- Meiri, S. (2024). SquamBase — a database of squamate (Reptilia: Squamata) traits. Global Ecology and Biogeography. Public domain (CC0).
- Moura, M. R. et al. TetrapodTraits: a database of 33,281 tetrapod species. Used under CC BY 4.0. Observed values only; this encyclopedia does not publish its imputed predictions.
- Catalogue of Life (dataset 3LR), used under CC BY.
- Oskyrko, O. et al. (2024). ReptTraits: a comprehensive dataset of ecological traits in reptiles. Scientific Data. Used under CC BY 4.0.