The common European adder is the only venomous snake native to Britain and the most northerly-distributed snake in the world, found within the Arctic Circle in Scandinavia. Recognizable by a distinctive dark zigzag pattern down its back, the adder relies on patience and ambush rather than speed, spending hours basking in sunlight to warm its ectothermic body before hunting. Despite its fearsome reputation, adder bites in humans are rarely fatal — fewer than 15 deaths have been recorded in the UK over the past century.
About the Viper
Vipera berus
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💡 Fun Facts
01
The adder is the only venomous snake that survives in truly Arctic climates — in northern Scandinavia, it hibernates for up to 8 months of the year.
02
Adders give birth to live young in late summer — females retain eggs internally until hatching to buffer them against cold northern climates.
03
Male adders perform ritualized wrestling 'dances' in spring, each trying to pin the other's head to the ground, without using their venom.
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An adder can strike and return to striking position in less than one-eighth of a second — faster than the human eye can follow.
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The zigzag pattern on an adder's back is unique to each individual, like a human fingerprint, allowing researchers to identify specific snakes.
📍 Where to Find This Animal
Habitat Types:
Heathland & Moorland
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