Leucistic Yellow-rumped Warbler10/03/2011 00:06:34Leucistic Yellow-rumped warbler. Photo by Robert Barber. These images of a Yellow-rumped warbler, were sent in by reader Robert Barber. Robert saw this leucistic Yellow-rumped Warbler at St. Mark's National Wildlife Refuge in Florida. Leucism (or Leukism)Leucism is a very unusual condition whereby the pigmentation cells in an animal or bird fail to develop properly. This can result in unusual white patches appearing on the animal, or, more rarely, completely white creatures. Click here to see our gallery of albino and leucistic animals and birds.
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