American Yellow Australian Ino roseicollis. The slightly bluish rump and gray-barred tail feathers are characteristic of this combination, and serve to distinguish it from the American Lutino

Danish Violet American Cinnamon roseicollis. On the left, the rump of a single-factor Violet bird; on the right, double factor. A second Violet factor intensifies the lilac color on the rump and also darkens the plumage overall

Green birds split for Australian Yellow can be easily identified by a yellow spot on the inner surface of the legs, just above the hock

Roseicollis which are heterozygous for the Red-suffusion factor have rectrices which are almost totally melanic (black)

Normal and Red-suffusion heterozygote roseicollis. The melanic (black) rectrices of the bird on the left differ from the rose-pink-and-black coloration of the normal roseicollis form (right). This characteristic occures in birds heterozygous for the Red-suffusion factor; this makes it easy to identify heterozygotes

The only roseicollis mutation that produces a sexual dimorphism is the Australian Yellow factor. The male on the left, has a bright yellow rump and rectrices, while the female, on the right, has a much more greenish color in these areas

In Pastel roseicollis, the expression of factors that affect structural coloration is most evident on the rump. Upper left, Danish Violet Pastel (one factor). Lower left, Cobalt Pastel (one Dark factor). Right, Pastel (no structural factors)

Birds "split" for the Orangeface factor can be easily identified by the orange marks in the tail feathers (on left). Instead of the rose pink of normal birds. In fact, the term split should be avoided, because the whole body is slightly orangeish, a characteristic of the third phenotype produced by an incompletely dominant character

Rump alteration in roseicollis with various factors. Upper left, Lutino (white). Lower left, Australian Ino (blue). Right, Australian Yellow (yellow tinged with green)