Whooper swan (cygnus cygnus) honking, martin mere, uk

uk swan vertebrates water migrate waterbird birds honking martin animals hunters sociable monogamous wildlife carnivorous nature predator vertical waterbirds verticals migrates aves predation zoology aquatic social whooper bird vertebrate migratory carnivore predators meat mere cygnus swans migrating anatidae monogamy anseriformes hunter fauna cygnus animal