Why do some birds have special feathers for waterproofing?
Quick Answer
Waterbirds need feathers that repel water so they can stay warm, buoyant, and light. Oils from a gland near the tail help maintain this waterproofing.
The Full Story
Many birds spend time on water, so their feathers must resist soaking. A gland near the tail, called the uropygial or preen gland, produces oils that birds spread across their feathers during grooming. This preening helps feathers stay aligned, flexible, and water-resistant. Air trapped between well-kept feathers improves insulation and buoyancy, which is vital for ducks, cormorants, and seabirds. Without this maintenance, birds would lose heat faster and become much less efficient in water.
Key Facts
YouTube Angle
Suggested video title for this topic:
"Birds have a built-in waterproofing system — and they apply it themselves."
Was this answer helpful?
Tap a reaction — it helps us pick what to cover next.