Key Identification Features
- The head of Vipera berus is fairly large and distinct, with almost flat, vertical sides.
- The supraoculars are large and distinct, and each is separated from the frontal by one to four small scales.
- A distinctive dark V or X marking is usually present on the dorsal surface of the head.
- Unlike most snakes, the sexes of this species can often be distinguished by colour.
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