Yellow feathers around my cockatiel's beak turned green
(Pinehurst, NC, USA)
My extremely unfriendly cockatiel, whom we recently learned was female when she laid eggs after many years of living with us, has green around her beak. She recently laid two more eggs, and now the yellow feathers around her mouth are green. Is she okay? What is it that is turning her feathers green only on her face? And what do I do to fix it?