Leucistic Dark-eyed Junco

Leucisim in birds, is a genetic mutation that prevents pigment, especially melanin, from being deposited in a normal way on a bird's feathers. Usually the leucistic areas are noticeable on birds with black or brown feathers, as in the above cases. Leucistic birds may have white splotches, or look paler or bleached. This is different than albino birds. Albinism is a genetic mutation that prevents the production of melanin in a bird's body. Albino birds usually appear all white with a pink eye. Scientists are still working out what these two conditions are and how they affect birds.
Birds with leucisim or albinism may have a harder time in the wild, as they may be more visible to predators and not as attractive to a potential mate. Leucisim is very rare in birds.
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