European adder (Vipera berus) 2 adult males, 1 black form, fighting, Suffolk, England, April

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Photo credit: © paul sawer / Alamy / Afripics
License: Royalty Free
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Keywords: adder, adders, animal, berus, black, britain, british, europe, european, fight, fighting, male, males, nature, reptile, reptiles, snake, snakes, vipera, wildlife