The count of Purple Martins last night, Aug. 6, 2012, was 19,500 birds with a Peregrine Falcon, and a Red-tailed Hawk taking birds. I suspect that the drought and high temperatures have caused the Martins to delay their departure. My best guess of when the highest count of Purple Martins will be between August 9 and August 14th. Sue Ridd Glen Allen, VA.