Reptile atlas

Geographical Origin and Habitat: Pseudocerastes fieldi is native to the arid and semi-arid regions of the Middle East, with a range encompassing Israel, Jordan, the Sinai Peninsula of Egypt, western Iraq, southern Syria, and northern Saudi Arabia. It inhabits sandy and rocky deserts, dry riverbeds (wadis), gravel plains, and rocky hillsides with sparse xerophytic vegetation. It occurs from sea level up to elevations exceeding 1200 meters, sheltering beneath large stones or in abandoned rodent burrows.

Taxonomy and Genetics: It belongs to the family Viperidae and subfamily Viperinae. Initially described as a subspecies of Pseudocerastes persicus, it was later elevated to a distinct species based on genetic, morphological, and venom composition differences. The venom of P. fieldi contains potent neurotoxins that are completely absent in P. persicus (which possesses primarily hemotoxic venom), illustrating evolutionary divergence through geographical isolation.

Behavior and Habits: It is a terrestrial reptile, primarily nocturnal during the hot summer months and crepuscular or diurnal during the cooler spring and autumn seasons. It is generally slow-moving and secretive. When threatened, it produces a loud hissing sound by rubbing its lateral scales together and can strike with remarkable speed. It frequently utilizes sidewinding locomotion to travel across loose desert sands without overheating.

Morphology: This is a medium-sized viper, with adults averaging 60 to 80 cm in total length. The body is stout and heavy, with a broad, triangular head distinct from the neck. Above each eye is a horn-like structure composed of several small, overlapping scales (unlike the genus Cerastes, where the horn is a single spine). The dorsal color ranges from yellowish-grey to pale brown, marked with dark, rounded blotches.

Terrarium Setup: Requires a large desert terrarium, measuring at least 120x60x60 cm for a single adult. The substrate must be kept dry and should consist of a sand-clay mix compacted to prevent the snake from inhaling loose dust or developing skin issues. Provide numerous dry hiding areas using stable rock formations, cork tubes, and thick branches to facilitate climbing.

Lighting and Heating: As an ectotherm from hot desert regions, it requires a steep thermal gradient. Daytime temperatures must range from 26°C on the cool side to 35-38°C directly under the basking spot. Nighttime temperatures should drop to 20-22°C. A 10% UVB lamp is mandatory to allow proper vitamin D3 synthesis and calcium metabolism, simulating natural desert sunlight.

Humidity and Hydration: Humidity must be kept very low, ideally between 30% and 40%. High humidity or wet substrates will rapidly lead to respiratory infections and scale rot. Provide a small, heavy water bowl, but remove it if it raises the humidity levels too high; many specimens prefer to drink water droplets misted onto rocks once a week.

Feeding and Supplementation: Strictly carnivorous. In captivity, they feed on appropriately sized mice or small rats. Juveniles should be fed every 7-10 days, while adults can be fed every 14-20 days. Thawed prey must be offered using long feeding tongs. Dietary supplementation is generally not required if rodents are of high quality.

Compatibility: Must be housed individually. Pseudocerastes fieldi is a highly venomous snake whose bite can be fatal to humans. Handling must be kept to an absolute minimum and performed only by experienced professionals using specialized snake hooks and containment tubes. It is completely unsuitable for hobbyist community tanks or beginners.

Health and Common Diseases: Common health issues include respiratory infections caused by cold drafts or high humidity, impaction from accidental sand ingestion, and external parasites. Scale rot can be prevented by keeping the enclosure dry and clean, spot-cleaning waste immediately, and ensuring shedding is completed successfully.