Before reading about the individual inheritance of each The A mutation is any abnormality, be it for color or anything else, that can be passed on from a parent to some members of succeeding generations. See more ideas about cockatiel, pet birds, parrot. Most males moult out the pearl pattern on maturity. (Click here to learn more about bird pigmentation.) Back to main page. (parseInt(navigator.appVersion) >= 3 )) || // -->