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Common adder
common european crossed adder basking in natural habitat ( Vipera berus )
Common European adder or viper (Vipera berus), Emsland, Lower Saxony, Germany
Agastache rugosa 'Black Adder'; giant hyssops, perennial with purple blossoms

Puff adder (Bitis arietans) is a highly venomous viper species.

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