Male Common Nighthawks plummet quickly to within 1 meter (about 3 feet) from the ground during their aerial displays. Their descent is characterized by a “booming” sound, produced as air rushes through the primary feathers, an example of how some birds create sound mechanically. This display may be directed at mates, intruders, or sometimes at a passing human.
Location: Malheur National Wildlife Refuge, Oregon
Video run-time: 2:41
Host source: YouTube