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Posts Tagged ‘cell differentiation’

Over near the Ponca Arkansas low water bridge over the Buffalo River, there is a family of crows that always contains a couple to White Winged crows that have Leucism. Leucism (occasionally spelled leukism) is a general term for the phenotype resulting from defects in pigment cell differentiation and/or migration from the neural crest to skin, hair, or feathers during development. This results in either the entire surface (if all pigment cells fail to develop) or patches of body surface (if only a subset are defective) having a lack of cells capable of making pigment.

These birds are hard to find and photograph; although I did get a parting photograph of the individual with a Canon 7D and a Canon EF 300L f/2.8 IS lens:

 

 

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