what is the purpose of preening in birds
Among our pet birds, the uropygial gland (preening gland or oil gland) is found on budgies, parrots (except Amazon parrots), canaries, most finches, cockatoos and waterfowl. It is absent in doves, pigeons, Amazon parrots and Hyacinth macaws.uring preening, a bird transfers this oil to its feathers by rubbing its head and beak against the oil gland and then spreading the oil over the feathers on the rest of the body..