What are hydrophobic feathers?

Hydrophobic feathers are feathers that repel water, just like how a raincoat keeps you dry when it rains.

Imagine your favorite waterproof backpack, no matter how much rain pours down, the water rolls off instead of soaking through. That’s what happens with hydrophobic feathers. When a bird with these kinds of feathers shakes its body after getting wet, the water droplets just bounce off like little balls, leaving the feathers dry and fluffy again.

Feathers have tiny structures that look like a forest of tiny hairs or ridges. These tiny features work together to make water slide off easily, kind of like how a smooth stone makes a stream move faster than rough rocks do.

When water hits the feather, it can't stick to it because the surface is too slippery for the water to hold on. The water just rolls off, keeping the bird warm and dry even in the rainiest days!