Starlings can be so entertaining. They do these stuntlike flock-flying exercises in the evening, creating the most beautiful forms on the evening sky. Sweetheart and I watched them on two consecutive nights, wondering, what might make them do this. It must cost them lots of energy to swipe and roam through the sky at lenght. But to what avail? It could not have been feeding, as they were too high for catching insects. And I doubt, they did it just to entertain us. Any answers, anybody?