The Cinnamon Cockatiel
The Cinnamon cockatiel is a mutation which causes the feathers which are normally grey to appear brown. The plumage color can range from a tannish-grey to a chocolate brown.
The male Cinnamon cockatiel, like its normal grey counterpart, develops a bright yellow face and bright orange cheekpatches upon maturity. Immature and female Cinnamon cockatiels retain their dull orange cheekpatches, their faces do not turn yellow, and they have white or yellow barring on the underside of their tails.