Starling murmuration performs aerial acrobatics in the winter evening sky

starling murmuration swarm acrobatics winter evening sky swirling liquid motion murmurations wildlife phenomena aerial dance flocks bird starling murmuration spiralling patterns background nature flock flight birds fly wildlife animal dusk starlings silhouette roost sturnus vulgaris migration pattern flying uk phenomenon natural flocking thousands swoop swirl shapeshifting spectacles wide shot environmental outdoors copy space birdwatching cumbria