Species profile · Boidae

Lichanura trivirgata

Complete care sheet and morph genetics registry for the rosy boa — husbandry parameters, diet, breeding and pairing calculator.

RosyBoa roséRosenboaThree-lined BoaCoastal Rosy Boa
Adult size
0.6–1 m
Lifespan
18–30 yrs
Difficulty
Beginner
Temperament
Docile
Activity
Crepuscular
Reproduction
Viviparous
01

Husbandry requirements

Rosy Boa — origin: Southwestern United States (California, Arizona) and northwestern Mexico (Baja California, Sonora): rocky deserts, arid scrubland and rock scree..

Terrarium temperature gradient

Night min18 °C
Cool side22–26 °C
Warm side28–32 °C
Basking spot32–35 °C

A horizontal thermal gradient is essential. Localized hot spot of 32-35 °C via heat mat/spotlight. A nighttime drop is beneficial. For breeding, a winter brumation of 6 to 10 weeks at 10-15 °C is necessary.

Enclosure (adult)
90 × 45 × 45 cm

Terrestrial desert/arid-type terrarium

A 90x45x45 cm terrarium suits an adult. Well-secured lid: this boa is surprisingly strong at forcing openings. Provide at least two tight hides (warm side and cool side) and a few rocks/roots. IMPORTANT: the family Boidae is listed on CITES Appendix II (EU Annex B); keep the documents proving the animal's legal origin.

Humidity
30–50 %

An arid-habitat species: maintain a dry environment. Offer a temporary humid hide only during shedding to help the skin detach.

Substrate
Aspen shavingsWell-draining sand/loam mixAbsorbent paper (breeding/quarantine)

Keep the substrate dry. Avoid loose fine sand if the animal is fed directly on it (risk of ingestion and impaction); instead feed on a clean surface.

UVB
Optional

Not essential for this crepuscular/nocturnal species. Low-level UVB (index 2-5%) still benefits wellbeing if the photoperiod is respected.

Water source
Always available

A small dish of clean, fresh water. Some keepers do not leave it available permanently in order to maintain low humidity, but offer water regularly; ensure the water does not soak the substrate.

Origin
Boidae

Southwestern United States (California, Arizona) and northwestern Mexico (Baja California, Sonora): rocky deserts, arid scrubland and rock scree.

02

Feeding & health

Diet

Strict carnivore (rodents) — Mice of appropriate size (pinkies to adult mice), preferably pre-killed and thawed.

Generally an excellent feeder. Juveniles fed every 5-7 days, adults every 7-14 days. A species prone to obesity: do not overfeed.

Breeding
Viviparous

Small litters. Sexual maturity around 2-3 years. A winter brumation (10-15 °C) is the main breeding trigger; gestation of about 4-5 months.

Health watch points
  • Respiratory infections (often linked to excessively high humidity or insufficient temperatures)
  • Dysecdysis / incomplete shedding (lack of a humid spot during the shed)
  • Obesity from overfeeding
  • Mites (Ophionyssus natricis)
  • Impaction/digestive retention (unsuitable substrate or temperatures too low for digestion)
03

Morphs & genetics

Registry of 5 documented genes and 2 named combos for Rosy Boa.

  • Albino (Whitewater Line) whitewaterRec
  • Albino (Limburg Line) limburgRec
  • Anerythristic aneryRec
  • Axanthic (Coastal) coastal axanthicRec
  • Hypomelanistic hypoRec
Named combos — 2 documented combined morphs
SnowGhost
04

Pairing calculator

Pick each parent's genotype — clutch probabilities update live. Free, no sign-up.

🧬

Rosy Boa × Rosy Boa

Probabilities per gene (independent loci).

GeneParent AParent B
Expected clutchSelect at least one gene on a parent.
05

Frequently asked questions

Answers to the most common questions about keeping the rosy boa.

How big does an adult Rosy Boa get?
An adult Rosy Boa typically measures 0.6–1 m (total adult length. females are generally slightly larger; some individuals reach 110 cm. a stocky species but of a very manageable size.).
What temperature and humidity does a Rosy Boa need?
A gradient of roughly 22–26 °C on the cool side to 28–32 °C on the warm side, with a basking spot of 32–35 °C. Humidity 30–50 %.
What does a Rosy Boa eat?
Strict carnivore (rodents): Mice of appropriate size (pinkies to adult mice), preferably pre-killed and thawed..
Is the Rosy Boa a good reptile for beginners?
Beginner level. Extremely docile, one of the calmest snake species; very rarely bites. Non-venomous (constrictor). Often curls into a ball without aggression when stressed. Plan ahead: a lifespan of 18–30 yrs.

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