
Source: Wikimedia Commons
Gonyosoma boulengeri
An arboreal colubrid with a long, mobile, scaled protrusion on the tip of the snout, likened to a rhinoceros horn, which gives it its name. A fine black line runs from the pointed snout through the eye to the neck, and the throat and upper labials are whitish to pale green.
The rhinoceros rat snake (Gonyosoma boulengeri) is an arboreal colubrid ranging from northern Vietnam into southern China and measuring 100-160 cm. Its most distinctive feature is the long, mobile, scaled protrusion on the tip of the snout, likened to a rhinoceros horn, which gives it both its English and Japanese names. There are 19 rows of dorsal scales at midbody. A fine black line runs from the pointed snout through the eye to the neck, and the throat and upper labials are whitish to pale green. Hatchlings are brownish grey with dark edging on some dorsal scales; at 12-14 months they turn steel grey and by about 24 months take on the bluish-green to green adult colour, though a rare few keep the steel grey. It lives in subtropical forest at 300-1,100 m, especially in valleys with streams, keeping mainly to shrubs and the lower levels of trees. Sources differ on its activity, some describing it as chiefly diurnal and others as mainly nocturnal. It matures at about two years, mates in April and May, lays five to ten eggs, and the young hatch after 60-90 days at 30-35 cm.
Source: Wikipedia (CC BY-SA 4.0)
The Rhinoceros Rat Snake lives 10-16 years.
The Rhinoceros Rat Snake grows to 100-160cm total length.
Origin
Northern Vietnam (Ha Tinh, Vinh Phuc, Yen Bai and others) and southern China (Guangxi, Hainan and Yunnan), in subtropical forest at 300-1,100 m, especially in valleys with streams
Lifespan
10-16 years
Sources: Reptile Database: Gonyosoma boulengeri / Wikipedia (English): Rhinoceros ratsnake / Wikipedia (German): Spitznasennatter
Edited & verified by: BreederDirect editorial team
The taxonomic, regulatory, and husbandry data on this page are compiled and verified against the authoritative primary sources below.
Accepted name: Gonyosoma boulengeri (Mocquard, 1897)
Synonyms: Rhynchophis boulengeri Mocquard, 1897, Proboscidophis versicolor Fan, 1931
Authority databases: GBIF · Reptile Database
Nomenclature follows global taxonomic authority databases.
Not listed in any CITES appendix (no listing record in Species+). The IUCN Red List assessment is Least Concern (LC). This species is neither included among the designated animals listed in the Animal Welfare and Management Law Ordinance Schedule nor designated as an alien species under the Invasive Species Act Ordinance.
Sources: CITES Species+ (species not listed) / IUCN Red List
Regulations may change. Always verify the latest information with the relevant authorities.
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Size
100-160cm total length
Temperature
25〜32℃
Humidity
40〜70%
Carnivorous: small mammals such as mice, birds, reptiles and amphibians, and at times insects and even fish
It lives in subtropical forest at 300-1,100 m, particularly in stream valleys. As a montane rather than lowland tropical snake it does not need the high temperatures of the latter; keep humidity relatively high with good ventilation and a clear thermal gradient.
An arboreal snake of shrubs and the lower canopy, it needs a tall enclosure with slender horizontal branches at several heights. Plants, real or artificial, give it cover and help it settle. Reflecting its streamside habitat, keep a water container permanently available. Lay the enclosure out to avoid sharp materials and mesh contact that could damage the rostral appendage.
In the wild it takes mainly small mammals such as mice, along with birds, reptiles and amphibians, and at times insects and fish. In captivity offer frozen-thawed mice sized to the snake. Hatchlings need very small prey, so start with pinkies or lizard-scented alternatives.
Generally highly strung, darting away among the branches when startled. The rostral appendage is easily damaged, so avoid forced handling. Snakes can prey on one another, so keep it singly.
Not listed on any CITES appendix. It is assessed as Least Concern (LC) on the IUCN Red List. It appears neither on the schedule of designated dangerous animals under the Order for Enforcement of the Act on Welfare and Management of Animals nor on Japan's list of invasive alien species. The old genus name Rhynchophis is still in circulation, so confirm the identity when buying. Colour changes dramatically with age, so do not mistake a steel-grey juvenile for a different species.
Intermediate. This is an intermediate-level species. Some prior experience and knowledge of environmental management are recommended.
The average lifespan of Rhinoceros Rat Snake is 10-16 years. With proper care and nutrition, they can live a long and healthy life.
Rhinoceros Rat Snake typically reaches 100-160cm total length as an adult. Size may vary depending on care conditions and individual genetics.
Rhinoceros Rat Snake feeds on: Carnivorous: small mammals such as mice, birds, reptiles and amphibians, and at times insects and even fish. Aim for a balanced diet with appropriate feeding frequency.
The price of Rhinoceros Rat Snake varies significantly depending on morph, size, and lineage. Check our market price page for the latest pricing information.
Last updated: September 17, 2026