Black swan (cygnus atratus) resting with head on back, slimbridge, uk

swan horizontals waterbird birds bird animals horizontal wildlife slimbridge predator black waterbirds aquatic social bird wetland vertebrate carnivore resting swan british swans migrating developed country england uk monogamy cygnus europe uk vertebrates britain water escapee migrate hunters sociable wwt monogamous head carnivorous nature united kingdom introduced wetlands migrates aves predation english zoology migratory atratus predators meat developed countries cygnus back european anatidae anseriformes hunter fauna animal