Murmuration of starlings gathering above their roost against the evening sky

starling murmuration beautiful winter evening sunset thousands birds nature murmuration of starlings flock flight sky fly wildlife background dusk bird flock silhouette swarm bird roost group sturnus vulgaris migration pattern flying uk phenomenon acrobatics swooping natural outdoor flocking in flight european starling birds flying cumbria starlings murmurations mesmerising roosting biodiversity red list blue natures spectacle amazing aerobatics orange