alikho igama elithi "preen gland" ngolimi lwesiNgisi. Nokho, igama elithi "preen gland" livame ukusetshenziswa endabeni yezinyoni.Ezinyonini, i-preen gland (eyaziwa nangokuthi i-uropygial gland) iyindlala etholakala ngaphansi komsila ephumela ngaphandle. into enamafutha. Izinyoni zisebenzisa le nto ukuze zilungise futhi zilungise izimpaphe zazo, okusiza ekugcineni izimpaphe zazo zihlanzekile, ziguquguquke futhi zingangeni emanzini. I-preen gland iyingxenye ebalulekile yendlela yokulungisa inyoni, futhi itholakala ezinhlotsheni eziningi zezinyoni.