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Preening, Preening and More Preening
Preening feathers is an important activity. Birds rub their bill against an oily sac at the base of the upper tail feathers, called a preen gland, and distribute oil over their feathers. They adjust the feathers for flight and oil them for insulation. Oily feathers are especially beneficial for birds who have considerable contact with water. Scratching near the ears is believed to be performed for further spreading of oil and removing parasites where their beak will not reach.
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