vipera berus nikolskii - forest-steppe adder in natural habitat

viperidae summer european outdoor natural nikolskii berus body adult curled toxic herp serpent forest environment herpetology common viper beautiful green nature indigo macro fauna reptilian closeup reptile eye black poison vipers predator attack grass aspis danger big vipera dangerous snake poisonous venomous wildlife venom background wild asp adder animal nokolskii forest-steppe habitat melanistic form