Sunday, December 12, 2010

There are numerous online guides to budgerigar (budgie) mutations. Here are the four main categories (according to Colouration Mutations, Striping Pattern Mutations, Pied Mutations and Rare Mutations. Each category is comprised of numerous subcategories; the first under "Colouration Mutations" is "Base Colour":

"All budgies fall into one of two basic varieties. Either they have a yellow pigment base (dominant) or they lack a yellow pigment base and are therefore white-based (recessive). In general, the base color is visible in the mask feathers and between the black stripes of the head and wings. (The exception is the yellow-face variety.) Normally, the body feathers are structured to reflect blue. In yellow-based budgies the blue in the body feathers combines with the yellow base pigment, which results in a bright green, the most common variety. In white-based budgies there is no yellow base pigment, so the blue structure of the body feathers results in bright blue coloration."

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