The flock was feeding on grass seed heads in a low, damp area of a dormant cultivated field. They would all land on the grass or ground for a few seconds, then take flight again, swirling and gyrating for a few seconds as they gathered and landed once again to feast on the seed. It appeared to be a black cloud at times and when they turned perpendicular to the sun, the red patches on the shoulder of the males would become visible.
It's amazing what you see when you go look!