Murmuration is the intricate choreography of a large starling flock when they are swooping along the sky. It is a wonderful phenomenon and looks like an undulating cloud that shifts directions suddenly as it moves in the sky. As it is relatively warmer in Netherlands during winters, the starlings decided to stick to the same country last year instead of migrating to the countries in the South. It was a brilliant airshow and Jan van IJken , a filmmaker, made a short film on it known as The Art of Flying. You can view the full movie in his website. You can look at the shortened version of this phenomenal effect and the sound of the birds will really soothe your senses.
(via Laughing Squid)