Cockatiel

The Cockatiel (Nymphicus hollandicus), also known as weiro bird, or quarrion, is a member of its own branch of the cockatoo family endemic to Australia. The emotional state of the cockatiel is expressed by its characteristic crest. When the cockatiel is calm or peaceful, the crest is gently oblique, strikingly vertical when startled or aroused, and flattened towards the head when furious or defensive. When the cockatiel is attempting to appear seductive or flirty, the crest is held flat and occasionally extends outward from the back. The crest of a fatigued cockatiel is seen halfway up, with the tip of the crest typically curving upward. The cockatiel has lengthy tail feathers that makeup around half of its overall length, in contrast to most cockatoos.

The "regular grey" or "wild-type" cockatiel has mainly grey plumage with noticeable white flashes on each wing's outer edge. The female's face is mostly grey or light grey, whilst the male's face is mostly yellow or white. Both sexes have a circular orange region on each of their ears, which is frequently referred to as "cheddar cheeks". Adult males typically have a vivid orange coloration, but females frequently have a subdued orange coloration.