What characteristic defines the appearance of the Penguin mutation in Zebra Finches?
Answer
Normal colored top with a bright white underside (sides, breast, belly)
The Penguin mutation results in a highly specific alteration of pattern rather than a full pigment loss or color shift. This variety is defined by having a top section—including the head, back, and wings—that retains its normal coloration. However, the entire underside of the bird, encompassing the sides, breast, and belly, is bright white. Furthermore, the male often loses the characteristic black breast bar and teardrop stripe, although the flank patches may still be present. This pattern creates a stark division between the colored upper body and the pure white lower body.
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