Adult ratites have no preen gland (uropygial gland) that contains preening oil. Cockatoos maintain their plumage with frequent preening throughout the day. Among animals, birds spend considerable time preening their feathers. Roosting, foraging, preening, bathing and dust-bathing or anting are communal activities. Condors bathe frequently and can spend hours a day preening their feathers. Courtship displays including bowing, billing and mutual preening. Birds also engage in mutual bowing, trumpeting, and preening. Other activities enjoyed by sun conures include taking baths and preening feathers. There are adaptive stereotypic behaviors such as grooming in cats and preening in birds. Their preening and posture saw them linked with the attribute of self-conceit. This is used while preening and helps reduce bacterial degradation of feathers by feather bacilli. This behaviour could include licking, rubbing or preening. These are conspicuously social birds, feeding together and engaging in mutual preening. Birds maintain their feather condition by preening and bathing in water or dust. Once the birds have paired, the bond is reinforced through bowing displays and mutual preening.