Snakes in Réunion

Reunion is a small volcanic island in the western Indian Ocean, east of Madagascar and southwest of Mauritius. Its terrain rises sharply from coastal lowlands and sugarcane plantations to high cirques, deep ravines, and the peaks around Piton des Neiges and the active Piton de la Fournaise. This compressed gradient, from warm coast to cool montane forest, creates the range of habitats where the island's snakes are found. Our database records 8 snake species for Reunion, of which 2 are noted as venomous. The large majority are non-venomous.

Like most isolated oceanic islands, Reunion has a limited native snake fauna and lacks the large terrestrial vipers and elapids found on nearby continental landmasses. Several of the snakes present are small, secretive species associated with leaf litter, soil, and disturbed ground near human settlement, including blind snakes and other burrowing forms that are easy to overlook. Some species reach the island through natural dispersal or human movement of cargo and plants, which is a common pattern on trade-connected islands. The result is a fauna weighted heavily toward small, harmless, ground-dwelling snakes rather than large hunters.

The venomous records for Reunion should be understood at a careful, general level rather than as a roster of confirmed dangerous land snakes. The clearest source of medically significant venom in this region is the marine environment: sea snakes and sea kraits range through tropical Indian Ocean waters and can appear near coasts and beaches, and these are front-fanged venomous reptiles. Among the few small terrestrial colubrid-type snakes, any venom is typically weak, rear-positioned, and not considered a serious threat to people. Treat the 2 flagged venomous species as a signal to keep distance from any snake in or near the water and from any snake you cannot identify, not as license to assume the rest are toys.

The harmless majority is what defines snake life on Reunion. These are mostly small to modest-sized non-venomous snakes that feed on insects, worms, small reptiles, amphibians, and rodents, filling quiet but real roles in the island's food web. By preying on insects and rodents they help limit pests around crops and homes, and in turn they feed birds and other predators. Snakes on an island like this are also indicators of habitat health, since they depend on intact ground cover, prey populations, and freedom from heavy persecution.

On safety, the honest picture is that most snakes you might encounter on Reunion are harmless, and the main caution is around the water rather than the forest, since sea snakes and sea kraits are the clearest venomous group in these waters. No wild snake should ever be handled, picked up, or cornered, regardless of how harmless it looks, because identification mistakes are exactly how avoidable bites happen. Definitive treatment for a venomous bite is professional medical care at a hospital, including antivenom when a clinician judges it appropriate, not anything attempted in the field. If a bite occurs, contact local emergency services immediately, and in the United States you can reach Poison Control at 1-800-222-1222.