Dice Snake

Fascinating facts about the Dice Snake

• A 1.2-metre (about 4 ft) dice snake can look like a living dice board, its belly flashing yellow or orange squares against black spots, exactly why early naturalists gave it the name tessellata. It can release a foul cloacal scent as a defence.
• When heavy rains flush an olm into a Bosnian stream, a dice snake has been observed trying to feed on it, though the amphibian proved too large. The snake’s diet normally includes fish and amphibians such as frogs and toads.
• From March to May dice snakes congregate in large groups, and they lay 10–30 eggs each in July.
• The hatchlings emerge in early September and hibernate from October to April in dry holes near the water.
• Although the species is listed as Least Concern overall, the Czech Republic now calls its dice snake population Critically Endangered, mainly because invasive American mink destroy riverbank nests. The stark regional decline reminds us that even common animals can vanish when ecosystems are disrupted.

At a glance

About the Dice Snake

The dice snake, Natrix tessellata, glides through Eurasian waterways with a sleek body that typically reaches 1.0–1.3 m (39–51 in). Its dorsal palette shifts from muted grey-green to deep brown or almost black, punctuated by dark spots, while the ventral side often flashes a vivid yellow or orange mottled with black dice-like markings, a striking contrast that gives the species its name. Favoring the edges of rivers, streams, and lakes, this colubrid is a consummate aquatic hunter, snapping up fish with swift, precise strikes. It will also take amphibians, frogs, toads, and even tadpoles, and on rare occasions has been seen attempting to prey on an olm (Proteus anguinus) flushed from a Bosnian cave, though the snake proved too small to swallow the cave dweller. When threatened, N. tessellata releases a foul cloacal secretion and can feign death, a dramatic thanatosis display that often convinces predators to lose interest. Reproduction clusters from March to May, when large groups gather; females lay 10–30 eggs in July, and the hatchlings emerge in early September, only to retreat to dry holes near the water for hibernation from October through April. The species’ ability to blend a potent anti-hemorrhagin in its serum with a suite of behavioral defenses makes it a fascinating example of evolutionary ingenuity, especially as it navigates the delicate balance of its riparian world…

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