Killdeer
Charadrius vociferus
                    
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DMSB0188
 
left Killdeer Photograph right
 
2019 Photograph, Killdeer, a Plover (Charadrius vociferus, Sandpiper Family, Scolopacidae) displaying (head down and neck ruff flared and tail spread), Huntley Meadows, Alexandria, Virginia, © 2020.
September is a little late for courtship, so this may be some kind of warning display between two males.
You are hearing a Killdeer calling while in flight.
Jian Zhe Li

Nature Photography, Wildlife Photography, Waterfowl Photography and Bird Photography from Marsh, River, Field and Forest Habitats.
All images Copyright © 1999 - by Gerry Gantt, all rights reserved.