Recent Examples of barbule from the Web
Some bird of paradise feathers, on the other hand, are irregular, with curved, spiky barbules and cavities within the feathers.
When light strikes a superblack feather's forest of barbules—which tilt at about 30 degrees toward the outer tip of the feather—it gets reflected into cavities between the tiny structures rather than outward, McCoy says.
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Britannica.com: Encyclopedia article about barbule
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