Friday when I was up in my stand there was a huge invasion of grackles that moved thru the treetops by the thousands. Small branches breaking off and loud "swoosh" noises from their wings and the calls that come out of their beaks. It was so noisy and it went on for almost 2 hours. Must be grouped on migration. Pic is from my trailcam I checked today, small number of them in pic compared to other day.