Massive Starling murmuration against dark clouds in the cold evening sky at Tarn Sike nature reserve Cumbria UK

starling winter murmuration nature flock flight birds sky fly evening wildlife background dusk starlings silhouette swarm roost flock of birds sturnus vulgaris migration flying landscape phenomenon acrobatics swooping natural flocking murmuration of starlings mass of birds starling flock european starling birds flying bird flock togetherness formation team beautiful magnificent natural pattern awesome fantastic outdoors nature art swooping mass massive flock awe inspiring impressive animal behaviour cumbria