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Adder

The adder is Scotland's only poisonous snake but is scarcely dangerous if not aggravated. Adders are identifiable by a dark zig-zag on their backs, but females can be distinguished by their greater length, duller colouring and orange eyes. Adders are often spotted around large stones and boulders, and on open stretches of moorland in summer. They can be hard to spot, given their tendency to avoid humans rather than attack where possible.
When to see this species : Spring, Summer
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