or sand viper, a small, agile, poisonous snake, Cerastes cerastes, of the viper family, Viperidae. Desert horned vipers are common in sandy deserts of Northern Africa and Western Asia. The adult is only 18 to 28 inches (45 to 70 centimeters) long but has classic viperine features: broad, triangular head with vertical pupils, narrow neck, robust body, and coloration that blends with the surroundings—in this species a pale sand tone with shadowy spots or bands. A sharp upright scale above each eye resembles a horn.
The desert horned viper moves swiftly across the loose sand by sidewinding, throwing oblique loops first with its top half and then with its lower half. With its sharp-edged scales it can shuffle into the sand with amazing speed, burying itself up to the eyes. It ambushes its prey, mostly lizards, by jumping out and striking with its venomous fangs. When disturbed, it warns of its presence by throwing its body into U-shaped loops and rubbing its scales against each other to produce a rasping sound. If pursued by a predator, it disappears into the sand with great speed. Its bite is seldom fatal to humans because of the snake’s small size and relatively weak venom.
The smaller Sahara sand viper (C. vipera) is similar in appearance and habits but lacks horns above the eyes. Both species are oviparous—that is, they are egg layers—producing clutches of 8 to 20 eggs
This article was critically reviewed by David Cundall
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