barbule

The microscopic barbule hooks onto the adjacent barb to maintain the feather's shape.

Look at how each barbule creates a tight seal against the wind.

If a barbule is damaged, the feather may split and lose its aerodynamic efficiency.

I wonder if the barbule structure differs between aquatic birds and land birds.

The scanning electron microscope revealed the intricate hooks on every single barbule.

Preening helps the bird zip each barbule back into its proper place.

The barbule is essential for creating the waterproof surface of the wing.

These tiny barbules act like a biological zipper for the plumage.

Without the interlocking mechanism of the barbule, flight would be nearly impossible.