Mt. Rungwe bush viper

Geographical Origin and Habitat: Native to the mountainous regions and high-altitude plateaus of East Africa, specifically southwestern Tanzania, northeastern Zambia, and northern Malawi. It inhabits montane rainforests, high-altitude swamps, and dense grasslands near watercourses, occurring at elevations between 800 and 2,000 meters above sea level.

Taxonomy and Genetics: Belongs to the family Viperidae, subfamily Viperinae, and the genus Atheris. Originally classified as a subspecies of Atheris nitschei, it was later elevated to a distinct species status based on genetic and morphological analyses showing distinct lineage differentiation and venom composition.

Behavior and Habits: Primarily arboreal and active during the day and twilight. It spends most of its time climbing on tall grass, papyrus, reeds, or low shrubs. It is an ambush predator feeding on frogs and small mammals. If threatened, it relies on camouflage, remaining motionless, but can strike defensively with highly active venom.

Morphology: Features a striking bright green or yellow-green coloration, often with black markings or zigzag stripes on the dorsum. Scales are heavily keeled, giving it a rough texture. The head is large, triangular, and distinct from the neck. Adults reach about 50 to 65 cm in length and possess a highly functional prehensile tail.

Terrarium Setup: Requires a tall, vertically oriented terrarium (minimum 60x45x60 cm). The layout should feature thin climbing branches, live plants (such as Pothos or Sansevieria) to create resting perches, and dense foliage for security. Use a moisture-retaining substrate such as coconut coir or peat moss topped with damp sphagnum moss.

Lighting and Heating: A low-output UVB bulb (5.0) is recommended to simulate a natural 12-hour day cycle. Heating should be provided from above with a ceramic heater or basking lamp (always guarded) to create a warm spot of 26-27°C (79-81°F). The bottom area should remain cooler at 21-22°C (70-72°F) with a slight drop at night.

Humidity and Hydration: Humidity must be kept high, between 70% and 80%. Mist the enclosure twice daily with dechlorinated water. The snake drinks water droplets from leaves rather than from a water dish. Ensure the terrarium has good cross-ventilation through mesh panels to prevent mold and bacterial growth.

Feeding and Supplementation: Feeds on small rodents, frogs, and lizards in the wild. In captivity, they adapt to feeding on appropriately sized frozen-thawed mice, offered via long safety tongs every 10-12 days. Dust the prey with a calcium and multivitamin supplement once a month.

Compatibility: This is a strictly solitary and dangerously venomous species. It must be kept individually in a secure, locked cage. Cohabitation is highly dangerous and is only acceptable during controlled breeding attempts by experienced keepers.

Health and Common Diseases: The primary risk is the handling hazard of a venomous snake. The reptile can suffer from respiratory infections due to cold drafts, shedding difficulties (dysecdysis) from insufficient humidity, and skin infections. Keep the terrarium clean and remove waste promptly.