Hidden below the outer breast feathers of herons, pigeons, doves, tinamous, bustards and some parrots are patches of special down feathers. These feathers are never molted, and they grow continuously. The tips break down into a dust the consistency of talcum powder. Using a fringed claw on its middle toe, a heron collects some of the dust — or powder down — and works it into its feathers. Sort of like the way you might work conditioner into your hair.

More info and transcript at BirdNote.org. 

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