Showing posts with label wing noise. Show all posts
Showing posts with label wing noise. Show all posts

Saturday, July 25, 2009

The Sound of Wing Beats

While disparate people may march to the beat of different drummers, disparate birds’ wings beat to different sounds. Over the years I have observed that the wing noise made by birds are distinctly different. So I have recently classified the various sounds into five levels: choppers, whistlers, flappers, flutterers, and whisperers.

The choppers—like noisy little helicopters—are the loudest wing beaters. Geese are real choppers. Their big wings steadily beat the air so loudly that I can hear them when they fly overhead, unless they are flying high. Most of the time, however, the incessant honking of Canada geese does a good job of masking wing sounds.

The whistlers are mourning doves. They’re not as loud as the choppers but they certainly grab your attention. For several years I thought doves were calling out as they flew, but then I came to realize that the sound is the tips of their wings shedding little musical vortices.

The flappers are medium-size birds like cardinals and woodpeckers. They are not the most graceful fliers. They furiously beat the air with their wings, creating a flailing sound that resembles a jazz drummer rapidly tapping with a rubber twig on partially-inflated balloons.

The flutterers are small birds like titmice, chickadees, and phoebes. They gracefully, quickly, and quietly zoom about the yard. I can hear their wings only when they are within a dozen feet of me, and only then if no insects are whining or breezes wafting. Their flight is acrobatic and sure. I marvel as I watch them land on a tree branch or the edge of the feeder, with pinpoint accuracy. In contrast, the whistling dove can be heard a hundred feet off. I cross my fingers as it comes clumsily in for a landing on the feeder, hoping that it won’t miss and tumble towards the ground.

The stealth fliers I call the whisperers. Owl flight is virtually silent, so I read; but they’re so shy that I’ve never gotten close enough to verify that. But I can testify to the whispering flight of whip-poor-wills. I once sat in the outdoor tub on a black, hushed night, watching a whip-poor-will fly sorties from a stump hardly 20 feet away from me. The bird repeatedly flew up, grabbed a bug, and circled back to the stump. My eyes could barely make out the bird’s inky form. My ears heard absolutely nothing.