The Lutino Cockatiel
Lutino cockatiels can range from all yellow to all white; one thing they have in common is both sexes have a bright orange cheekpatch. Some Lutinos have bright red eyes, but most have maroon colored eyes upon maturity.
It is very difficult to visually sex a Lutino cockatiel. Often on mature female Lutinos there will be a barring on the underside of the tail feathers which can be viewed in front of a bright light.