beak bird cob crowded Cygnus olor England english feathers flock Great Britain group mute natural nature neck plumage swan swim uk waterfowl white Windsor animal baby domesticated farm field fleece grass juvenile lamb landscape livestock mammal meadow sheep spring Sussex view wool young feed flood graze hill South Downs winter birds bond circle commune crow Crows flock of birds friends gathering hierarchy Incredible India krayker meeting roost silhouette social together tree Australian blue Cockatoos corellas demonstrative destructive docile garden pest grazing Noisy pest pet root eater show-off talker vocal yellow tail feathers hedge action aerial aerofoils air color colour diversity fly glide gliders hang-gliders on the move outdoor parachutes paragliders sky soar sport summer community congregate evening gather mast murmuration rooftop starlings Sturnidae Sturnus vulgaris suburban television town