Appearance
The Yellowface I Skyblue variety is the same in appearance as a normal Skyblue except that the forehead and mask, which is white in the normal Skyblue, is replaced by bright yellow, the short tail feathers show yellow instead of the normal white, and the undulations on the wings are often faint yellow. The yellow on the mask tends to leak down onto the breast to a small degree, giving it a green tinge. In juvenile plumage the yellow is considerably fainter and does not appear on the forehead, which is barred in the usual way, nor does it leak onto the breast to as great an extent.
The Yellowface I Cobalt and Yellowface I Mauve varieties have similar yellow markings.
The appearance of birds with other combinations of the Yellowface I mutation is discussed under Genetics below.
Read more about this topic: Yellowface I Budgerigar Mutation
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