Scientific name: Vipera berus

How to identify: Less than a metre long and greyish or brown in colour, with a darker zig-zag stripe down the back. Sometime adders can appear almost black.

Where: On Exmoor’s moorlands including mires where they bask on sunny tussocks.

Best time to see: Early spring

Did you know? he adder is Britain's only venomous snake, but will only use their venom as a last means of defence, usually if caught or trodden on.

Find out more: Wildlife Trusts

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