In captivity, a variety of mutations have occurred, including blue, yellow / lutino, white, blue pastel, green fallow, blue fallow, pied, and dilute. Below listed are the most common …
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- Albino Mutation: All-white plumage with red eyes. Recessive gene: both parents have to carry it to produce white offspring.
- White Mutation: White plumage except for some soft blue markings on the wing. The eyes are dark / black. Recessive gene: both parents have to carry it to produce white offspring.
- Lutino Mutation: The plumage is mostly lemon yellow; except the areas of plumage that are blue in the normal green male are white in the lutino male. The eyes are red. Sex-linked mutation.
- Blue Mutation: Males have a plumage of varying shades of blues, generally a soft powder blue with silvery, greyish-blue wash on the nape (back of the neck) and back. The face is turquoise blue; and the rump, back, and wings are deep cobalt blue. Females lack the cobalt blue rump and wings. Juveniles have a duller plumage. Simple recessive mutation – requiring both parents to carry the gene in order for the trait to show up visually in the young.
- Fallow Mutation: The plumage is golden green with the same cobalt blue markings of the normal form. Males have a bright yellow face. Females have a duller plumage and lack the cobalt markings. Simple recessive mutation – requiring both parents to carry the gene in order for the trait to show up visually in the young.
- American Dark Factor (Olive): A mostly olive-green plumage with very dark flight feathers. Immature birds have a darker plumage and lighten as they get older.
- Other Mutations: Cobalt, Pied …
