Starling murmuration motion trails effect with moving cloudy background

starling murmuration spiralling patterns cloudy background motion trails winter nature flock motion flight birds sky fly evening wildlife animal dusk starlings silhouette roost sturnus vulgaris migration pattern flying uk phenomenon natural flocking thousands action swoop swirl shapeshifting twilight hypnotic gatherings spectacles bird black copyspace locked off wide shot environmental outdoors murmurations copy space grey birdwatching