“The Common Nighthawk (Chordeiles minor) typically gives a nasal 'peent' in flight, but during the breeding season the males will make this unearthly 'booming' noise (@ 12s in the recording). The sound is entirely mechanical, made by flexing the wings in a steep dive and forcing air through the wing feathers. This display is mostly done to impress females, but sometimes also to intimidate intruders (me in this case).” – Jacob Saucier, Division of Birds #SummerRoadTrip #Playlist | Smithsonian Nat

Common Nighthawks can be hard to see as they roost quietly, but on the wing they become much more obvious. Look to the sky to see groups of nighthawks winging their way south! Learn more: https://abcbirds.org/bird/common-nighthawk/ | American Bird Conservancy