![](https://66.media.tumblr.com/bbd09d91b4900ba40adc720e5ee49056/tumblr_pgp9qyv5q11w6mx58_640.jpg)
a house sparrow dustbathes on the ground. most birds produce oil from their preen gland that is used to keep the feathers healthy; dustbathing helps regulate the amount of oil on the feathers, and also can assist with removal of parasites from the body, penetrating to the skin where the bird may not be able to remove them.
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