Both Helmeted Guineafowls in these photos are leucastic. Leucism is a genetic condition that results in the partial loss of all types of pigmentation. This causes white coloration, white patches, spots or splotches on the skin, fur or feathers of the animal.
In the first photo, the Helmeted Guineafowl on the right's body is almost all of the normal color of gray-black with white spots, but with some large white patches. The guineafowl on the left is almost all white, but still has some black in the neck area.
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