AT A GLANCE
- Common Name: Coin-marked Snake
- Scientific Name: Hemorrhois nummifer
- Category: Reptiles
- Subcategory: Snakes
- Range: Eastern Mediterranean, Western and Central Asia, including Cyprus, southern Turkey, Syria, Lebanon, Israel, Jordan, northern Egypt, Iraq, Iran, Armenia, and Central Asian republics
- Habitat Type: Dry rocky hillsides, Mediterranean scrub (maquis and garrigue), boulder-strewn canyons, ruined stone buildings, old olive groves, and drystone walls
- IUCN Red List Status: Least Concern
- Lifespan: 10 to 15 years
- Diet: Carnivorous (small rodents such as mice and voles, lizards including agamas and geckos, and nesting passerine birds)
- Average Size/Weight: Total length 100 to 140 cm (maximum up to 170 cm); weight 300 to 700 g
- Key Defining Feature: Slender, athletic, harmless racer snake adorned with a diagnostic dorsal row of large, circular, coin-shaped dark brown spots that mimic the venomous Ottoman Viper
Overview
The Coin-marked Snake (Hemorrhois nummifer), also widely known as the Asian Racer or Coin Snake, is a large, harmless colubrid snake native to the sun-drenched rocky landscapes of the Eastern Mediterranean and Middle East. Named for the bold pattern of rounded, coin-like dark blotches running down its spine, this agile and fast-moving serpent is famous for being a classic Batesian mimic: it closely resembles the dangerous, venomous Blunt-nosed and Ottoman Vipers, gaining protection from predators while remaining completely non-venomous.
Biology and Physical Characteristics
Hemorrhois nummifer has an elongated, slender, muscular body with smooth to weakly keeled scales and a long, tapering tail. Its head is broad, lance-shaped, and distinctly separated from a slender neck, with large round eyes featuring circular pupils (unlike true vipers which have vertical slit pupils). The dorsal ground color is a pale yellowish-grey, sandy-buff, or light olive, decorated along the midline with a neat series of 40 to 60 large, rounded, coin-shaped dark brown or olive-grey blotches narrowly edged in black. A smaller row of alternating dark spots runs along each flank. Its belly is smooth and pearly-white to pale yellow.
Behavior and Ecology
Diurnal and active, the Coin-marked Snake is a terrestrial and semi-arboreal hunter that navigates rocky screes and scales ancient stone walls with effortless grace. It is a visual hunter, actively patrolling stone terraces and olive groves for mice, lizards, and nesting birds, overpowering them with rapid strikes and swallowing them alive or pinning them with coils. When cornered or threatened, it flattens its head into a wide triangle, hisses loudly, and strikes defensively, mimicking a venomous viper so convincingly that humans and predators frequently mistake it for a lethal viper.
Conservation and Human Impact
The Coin-marked Snake is classified as Least Concern on the IUCN Red List. It is widespread, adaptable, and common throughout the Eastern Mediterranean basin. Despite being harmless and playing a vital role in rodent pest control, it is frequently killed by rural farmers who mistake its coin-patterned camouflage for a deadly viper.
Interesting Factoid
The Coin-marked Snake is a completely harmless constrictor, but when cornered, it flattens its neck into a wide triangle and hisses ferociously, mimicking the deadly Ottoman Viper so well that even snake experts have to look twice.