What is the structural difference defining the 'horn' on the European *Vipera ammodytes*?
Answer
It is a single soft, flexible protuberance on the snout above the rostral scale
The European viper's horn is structurally distinct, described as a single soft, flexible protuberance on its snout, composed of small scales arranged transversely, unlike the modified supraorbital scales of *C. cerastes*.
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