Question

what u understand by preen and uropygeal...??​

Answer 1

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Here is your answer

A Bird's Oil Gland - also known as Uropygial Gland or Preen Gland - Location and Function: During preening, birds gather oily secretions that contain diester waxes from their oil glands. This gland is located near the base of (just above) the tail. Birds distribute the oil over the plumage.

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