It might sound strange, but dirt helps birds scrub themselves clean. Birds of all sizes (like the Eurasian Skylark seen here) often scrape a depression in the ground and flick dirt onto their bodies, shimmying to shake it off. Experiments showed that birds use dust to prevent oils from building up on their feathers and to remove dandruff — much like humans using shampoo in the shower!
More info and transcript at BirdNote.org.
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