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Okinawa Pit Viper
Ovophis okinavensis
A small yet impressively heavy-bodied venomous pit viper endemic to the Ryukyu Islands of Japan, structurally adapted to survive in uniquely cool and damp local habitats.
Class:Squamata
Order:Squamata
Family:Viperidae
Subfamily:Crotalinae
Genus:Ovophis
Species:Ovophis okinavensis
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Environment
Terrestrial
Humidity
70 - 85 %
Day temperature
18 - 22 °C
Ambient temperature
18 - 22 °C
Night temperature
14 - 16 °C
Basking spot
24 °C
Adult size
100 cm
Minimum enclosure
>= 100 L
Brumation temperature
8 - 12 °C
UVB
Low
Species description
Geographical Origin and Habitat: The Okinawa pit viper, Ovophis okinavensis, also known as the Himehabu, is a venomous snake species endemic to the Ryukyu Islands of Japan, with well-documented populations on Okinawa and Amami islands. It inhabits montane forests, hill ridges, and areas surrounding mountain streams and springs. It prefers damp subtropical microhabitats rich in leaf litter and dense ground cover, which offer optimal hunting grounds and shelter.
Taxonomy and Genetics: Belonging to the class Reptilia, order Squamata, family Viperidae, subfamily Crotalinae, and genus Ovophis, this species is genetically distinct from other Japanese pit vipers, such as the genus Protobothrops. Evolutionary genetics suggest a unique adaptation allowing this species to maintain full activity during cold winter months, targeting winter-breeding ranid frogs.
Behavior and Habits: Terrestrial and nocturnal, this species shows an unusual activity pattern. Unlike most temperate reptiles, it exhibits peak activity from December to February at ambient temperatures ranging between 11°C and 20°C. This behavior allows it to exploit breeding aggregations of frogs (Rana narina and Rana okinavana). During the day, it shelters under rocks, fallen logs, or leaf litter.
Morphology: The Himehabu is a small but exceptionally heavy-bodied and stocky pit viper, with adults measuring between 30 and 60 cm in length. It possesses a large, flat, triangular head that is highly distinct from the neck. The dorsal coloration ranges from light brown to reddish-brown, decorated with alternating dark brown bands or square spots forming a checkered pattern. Loreal pits are present.
Care, breeding and tankmates
Terrarium Setup: A terrarium of 70x45x40 cm is appropriate for housing an adult due to their sedentary nature. The enclosure must feature reliable, professional lock systems to prevent accidental escapes. The substrate should consist of a mix of peat moss and coco coir topped with a deep layer of leaf litter and damp bark. Provide multiple hides in both thermal zones and a few stable flat rocks.
Lighting and Heating: This species requires cool conditions and is vulnerable to heat stress. Daytime temperatures should be maintained between 18°C and 22°C, with a warm area not exceeding 24°C. A nighttime drop to 13°C - 16°C is critical. Use low-output LED lighting on a 12-hour cycle. A low-strength (2%) UVB lamp is recommended to support health and natural behavior.
Humidity and Hydration: Maintain high humidity levels between 70% and 85%. Mist the enclosure daily with clean water, ensuring the substrate remains damp but not completely saturated. A sturdy, shallow water dish must always be present in the cool section, large enough for the snake to submerge its entire body, especially during shed cycles.
Feeding and Supplementation: Feed thawed, pre-killed mice using long feeding tongs. Adult Himehabu should be fed every 12 to 15 days, as their metabolism is slow in cool conditions. Overfeeding can lead to obesity and digestive issues. Dust prey items with a calcium and multivitamin supplement once a month for growing juveniles.
Compatibility: Because it is a venomous and medically significant species, it must be housed individually. Cohabitation is not recommended except for controlled breeding purposes managed by professionals. Ensure the terrarium is kept away from other pets and do not house with other reptile species.
Health and Common Diseases: Ambient temperatures exceeding 25-26°C pose a severe threat, leading to heat stroke and rapid death. Other common captive issues include scale rot from wet substrate, respiratory infections from poor airflow, and internal parasites. Safe handling with professional hooks is required, as their venom causes severe local swelling and tissue pain.
Geographic Origin and Distribution
The Okinawa pit viper, Ovophis okinavensis, also known as the Himehabu, is a venomous snake species endemic to the Ryukyu Islands of Japan, with well-documented populations on Okinawa and Amami islands. It inhabits montane forests, hill ridges, and areas surrounding mountain streams and springs. It prefers damp subtropical microhabitats rich in leaf litter and dense ground cover, which offer optimal hunting grounds and shelter.
Origin
East Asia
Reptile profile
- Diet
- No verified data available
- Life expectancy
- No verified data available
- Adult size
- 100 cm
- Lifestyle/Microhabitat
- No verified data available
- Activity cycle
- No verified data available
- Sociality
- No verified data available
- Reproduction
- No verified data available
- Handling tolerance
- No verified data available
- Brumation
- No verified data available
- Molting
- No verified data available
The catalog's scalar value is 100 cm. The ReptTraits v1.2 source reports a maximum adult measurement of 100 cm for this species, recorded as total length (TL). These figures are not interchangeable: the first is the profile's editorial reference, whereas the second is a published maximum under a specific measurement convention; differences among sources can reflect sex, population, life stage and measuring method.
Image gallery
Licensed images linked to the species or, when marked, to the closest representative taxon.
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