A mutation similar to dilute, having light golden-brown plumage and a bright red tail. However, opalines also have yellow, light brown, and even somewhat orange markings on the crest and wings, as well as a fully dark bill. The bird pictured is male, but has not yet lost its opaline markings like a cockatiel would. This either means that the bird isn’t mature yet, the mutation isn’t true opaline, or that opaline functions differently in cockatoos vs cockatiels.
