Starling murmuration flocks making amazing shapes in the evening sky

starling murmuration murmurations nature flock flight birds sky fly starlings evening swooping amazing murmuration of starlings winter spectacle whirling wildlife european starling background animal dusk silhouette swarm cumbria bird roost england group sturnus vulgaris migration pattern flying uk phenomenon acrobatics natural outdoor flocking seasonal thousands action birds flying bird flock shapes black white aerobatics bird of prey spooked