Adder (vipera berus) close-up of head, peak district, uk

uk berus vertebrates britain snakes horizontals veperidae blooded scaled animals adders serpentes horizontal limbless head adder scaly reptilia wildlife carnivorous nature united kingdom cold predator close up district english reptiles viperinae zoology serpent vertebrate carnivore vipera reptile ophidia developed countries ectotherms british peak predatory developed country european england carnivora uk squamata ectotherm cold blooded carnivores snake serpents fauna ectothermic animal europe