Grass snake (natrix natrix) head raised above water, covered in duckweed, tongue out, oxfordshire, uk

snakes horizontals animals horizontal swimming duckweed scaly reptilia wildlife grass cold predator lakes reptiles natrix serpent english vertebrate carnivore predator reptile ectotherms british mrash raised predatory developed country england carnivora uk squamata cold blooded lake carnivores serpents pond ectothermic europe uk vertebrates britain snake tongue 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