The birds invariably adopt a posture in which the body feathers are fluffed up and one or both wings are held out from the body, with feathers spread. It is thought that using the sun in this way does two things. It both helps the preen oil to spread across the feathers and drives parasites out from within the plumage.
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The birds invariably adopt a posture in which the body feathers are fluffed up and one or both wings are held out from the body, with feathers spread. It is thought that using the sun in this way does two things. It both helps the preen oil to spread across the feathers and drives parasites out from within the plumage.
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