Finally, there was a huge explosion of noise from the crows, and a great mass of them took off at once. The sky was full of wheeling shapes, and I could hear the flutter of their wings as well as their caws. There must have been close to a hundred of them swooping and darting about. About a dozen of the crows veered off from the mass and flew south, passing over my house, making an amazing amount of noise. The other birds returned to the trees. A few minutes later, most of that group took to the air and flew away to the north. Whatever the disturbance had been about, it was clearly over, at least for the moment.
About an hour later, I went outside again, and there was my old friend the acorn woodpecker, doing his dance atop the telephone pole in the gathering dusk, ending the day as it had begun. Birds are just born entertainers.