Right now scientist describe two kinds of Leucistic birds, pale and pied. Pale leucistic birds will have the same markings, but are extremely pale. Pied Leucistic birds, like the one in your photo, have patches of white. Leucistic birds are relatively unusual but much more common than albino birds which are completely white with pink eyes, legs and bill.
The bird is perfectly healthy but they may have it harder due to their different coloring and weakness in the feather structure. Predators may find them easier and mates may not find them acceptable at all.
You can read more at: http://www.birds.cornell.edu/pfw/AboutBirdsandFeeding/Albinism_Leucism.htm
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