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Owls' ability to fly almost silently gives them an air of mystery, but the science is in their wings and feathers. Learn how they do it in this episode of BrainStuff, based on this article: https://animals.howstuffworks.com/birds/owl-fly-silently.htm/printable

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Duration:
9m
Broadcast on:
09 Sep 2024
Audio Format:
mp3
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With services like verified pre-approval, which shows sellers you're a serious buyer, you have a competitive advantage when making an offer. Navy Federal Credit Union, our members, are the mission. Learn more at NavyFederal.org. Navy Federal is insured by NCUA, Equal Housing Lender, membership required, terms and conditions apply, loan subject to approval, call 1-888-842-6328 for details about credit costs. Welcome to BrainStuff, a production of iHeartRadio. Hey BrainStuff, Lauren Vogelbaum here. Few creatures are surrounded by as much myth and mystery as the owl. Sometimes they're marked as ominous portance of death and hardship, sometimes symbols of wisdom and prudence. From ancient texts to modern fantasy movies, owls have captivated us with their fierce hunting capabilities, striking appearance, nocturnal habits, and near-silent power of flight. Across the globe, legends developed around them. Some Hindu cultures associate the owl with the goddess Lakshmi, and consider it a symbol of luck and prosperity. The Greek goddess of wisdom, Athena, offered special protection to the owl as her favorite feathered friend. As a result, many owls lived the acropolis. The stealthy owl was also seen as protector of Greek armies. Owl imagery often decorated warrior shields, and some said that seeing an owl before a battle signaled a triumph would come. The Dakota Hadatsa have also viewed the owl as protectors to warriors. But others saw owls as predictors of death. But lore has it that the hoot of an owl announced the death of Julius Caesar. And several Southwestern American Native cultures associate owls with ill omens, and their coals with impending death. Today, let's look at one of the factors that makes owls so interesting, their silent flight. While it adds to owls' mystique, this superpower of sorts serves a very practical purpose. It helps them sneak up on their prey. It's the design of owls' wings and feathers that allows them to fly in almost absolute silence. The two things that cause the most noise when birds fly are the flapping of their wings and the noise of turbulence as they move through the air. That is, the sound of air flowing chaotically over and around their wings. Owls have broad wings with large surface areas that help them glide through the air without flapping very much. Less flapping makes less noise. And the owl's feathers work to reduce turbulence. And owls' primary feathers, which are the long ones forming the tip of the wing, are serrated like a comb on their leading edge. That's the edge facing forward as they fly. This comb-like design breaks down turbulence into smaller currents called micro-turbulences. Then, the opposite trailing edge of each primary feather has a tattered fringe shape that muffles the sound of air flowing over the wing and shifts the angle at which the air flows. These soft feathers allow air to pass through, which helps eliminate noise. As some researchers think that as the owl flies, these feathers may also shift sound waves created by the owl's wing to a higher frequency that prey can't hear. The owl's secondary feathers, which are the shorter ones that run from the mid-wing to the shoulder, are made up of soft fringes that reduce turbulence behind the wings. The trailing feathers on the back end of the wing are also tattered in shape, and the rest of the wing and legs are covered in short downy feathers. As the owl flies, the trailing fringe and tattered feathers break sound waves over the wings as the air flows over them. The downy feathers absorb any remaining noise created in flight that's above 2,000 Hz, thus eliminating most sounds that owl's potential prey can hear. So, the secret is in the wings. But does this noise-reducing design have a place in your next airplane flight? Engineers are always in search of ways to improve aircraft technology, and nature inspires the greatest innovations, sometimes called biomimicry. Researchers have looked to the design of owl's wings to reduce the noise created by aircraft while keeping take-offs energy efficient. For example, some have proposed the possibility of creating retractable fringe to mirror owl's trailing feathers, helping reduce turbulence and noise. And others think that applying a velvety coating on landing gear will absorb noise just as the downy feathers do on an owl's legs. Airports like O'Hare and Heathrow have strict noise restrictions on aircraft's take-off. If engineers find a way to reduce noise, more flights could take off every day, and revenue could increase. For an industry struggling with fuel costs and other problems, the wise old owl may provide some solutions. Today's episode is based on the article "How Can Owls Fly Silently" on howstuffworks.com, written by Sarah Winkler. 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