Just to add a little more input here, once you learn to recognize the spit n drum it is a great method to locate birds. Countless times I have been hunting steep country midday where the birds go and just heard the spit or drum while walking slowly and quietly. After developing an ear for it, I personally can hear it up to 150 yards away if conditions are calm. Good tip for finding birds midday when they always seem to disappear off the face of the earth.