Black swan (cygnus atratus) close,up, head in water foraging for food, slimbridge, uk

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