Hays Eaglet H14 accesses preen gland 2021 04 28 7:18:50

The uropygial gland, or preen gland, is an essential part of preening. This gland is found near the base of the tail and produces an oily, waxy substance that helps waterproof feathers and keep them flexible. While preening, birds spread this oil to each feather so they are evenly coated and protected.
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