Reptilia · Squamata
Simalia boeleniBrongersma, 1953
Black Python
Identification not confirmed. One observer recorded this animal as this species and no one has since agreed, so the photograph may show a different animal.
Photograph by Matthew Inabinett, CC BY, via iNaturalist
A nocturnal, meat-eating snake from the Australo-Pacific region, reaching 270 cm nose to tail.
Also called Boelen’s python.
Once published as Python boeleni — those names reach this page.
Reptilia › Squamata › Pythonidae › Simalia
- Grows to
- 2700mm
- greatest recorded
- Eats
- Carnivorous
- Active
- Nocturnal
- Lives up to
- 20.1years
Longer than only 49% of all pythons 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 750 to 7,900 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
32 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
- Data Deficient
- Status assessed · the year the Red List last looked
- 2014
The animal itself
- Limbs
- None
- Colour on the back
- Black, Brown
- Pattern on the back
- Banded, blotched
- Venomous
- No
- Longest recorded life
- 20.1years
Stark et al. 2020
Size
- Length nose to tail · greatest recorded
- 2700mm8 ft 10 in
- Body mass · greatestcomputed
- 7655.6g17 lb
- Body mass at hatching
- 107g3.8 oz
snakes only in this source
computed from length by a family-level allometric equation, not weighed
How it lives
- Diet
- Carnivorous
- Active
- Nocturnal
- Where it lives
- Arboreal, terrestrial
- Habitat
- Forest
- Biome
- Tropical & Subtropical Moist Broadleaf Forests
- Region
- Australo-Pacific
- Mainland or island
- Found only on islands
- Elevation · above sea level
- 1000–2800m
- Range size
- 95,124km²
mammals and birds (Barends and Naik 2023)
Stark et al. 2018
Arboreal&Terrestrial (Feldman 2015)
1700-2400 (Murphy et al. 2003), above 1300 (O'Shea 2018), 1000-2000+ (O'Shea 1996), max 2800 (Reed 2005)
Breeding
- Reproduction
- Oviparous
- Average clutch
- 14eggs
- Eggs or young per clutch
- 14–25eggs
- Egg length
- 83mm3.25 in
- Egg width
- 45mm1.75 in
Feldman et al. 2015
14-20 (O'Shea 2018), max 25 (Reed 2005)
Naming and history
- Suborder
- Serpentes
- Infraorder
- Alethinophidia
- Subspecies
- No
- Described by
- Brongersma
- Moved to another genus · since it was first described
- Yes
- Described in
- 1953
- Type locality
- Indonesia
Keeping one
8 ft 10 in × 4 ft 5 in × 13 ft 3 in(270 × 135 × 405 cm)
Minimum length × width × height, for one animal. Bigger is always better.
The standard sizes snakes as a fraction of total length: 1 × 0.5 × 1.5.
Recorded both on the ground and climbing, so this is the larger of the two rules in every dimension.
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 8 ft 10 in (2700 mm), at 1 × 0.5 × 1.5 times it, following the German federal welfare standard — how this is worked out.
No preferred body temperature has been recorded for Black Python. 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.
556kJ per day
Worked out for an animal of 7,656 g, the heaviest recorded for Black Python — 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 · greatest recorded
- — 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
- — Body mass · a typical adult
- — Body mass · adult female, mean
- — 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
- — Mean clutch · smallest reported
- — Mean clutch · largest reported
- — 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
- — Fangs
- — Body temp in the wild · lowest mean recorded
- — Body temp in the wild · highest mean recorded
- — Pupil
- — Sex decided by
- — Population trend
- — 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 Pythonidae
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). Simalia boeleni. Retrieved 2026-09-08, from https://www.allanglescreatures.com/species/simalia-boeleni
@misc{simalia_boeleni_2026,
title = {Simalia boeleni},
author = {{The Reptile & Amphibian Encyclopedia}},
year = {2026},
url = {https://www.allanglescreatures.com/species/simalia-boeleni}
}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.