northern viper

adder among angis animalia basking berus chordata coldadapted common cross dangerous devil diurnal english european folklore foraging hibernates hibernation leaves lizards mainly meaning melanistic middle mild nominate northern ovoviviparous pattern serpent snake species spring strike subspecies terrestrial thickbodied toxicity venom venomous vertebrata very viper vipera viperidae viperinae widespread yesteryea yesteryears zigzag