Grass snake (natrix natrix) head raised above water, oxfordshire, uk

snakes horizontals animals horizontal swimming scaly reptilia wildlife grass cold predator lakes reptiles natrix serpent english vertebrate carnivore predator reptile ectotherms british raised predatory developed country england carnivora uk squamata cold blooded lake carnivores marsh serpents pond ectothermic europe uk vertebrates britain snake blooded scaled wetland serpentes limbless head carnivorous nature united kingdom wetlands colubridae zoology oxfordshire ophidia developed countries ponds water european ectotherm reptile snake grass fauna animal