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Preening is a type of cleaning behavior, most commonly associated with birds. It involves birds using their bills to spread oil from their preen gland, located near the base of the tail, over their feathers. This oil is thought to help maintain feather structure and may also contribute to the health of the bill and legs. In some species, the preen gland oil, when exposed to sunlight, can be a source of vitamin D. Preening is a vital self-grooming activity for birds, ensuring the integrity and function of their feathers.12

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  1. preen gland
  2. cleaning behaviour

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