This is a very bad recording. Youíll have to turn your volume wayyy up to hear the bird, and you still probably wonít hear it. Itís sort of drowned out by cars and other birds, but itís in there, I promise. To me it sounds like an ascending zipper: https://drive.google.com/file/d/1NUj...w?usp=drivesdk
Also, is it possible to tell if this is a Cooperís hawk or Sharp-shinned hawk?