



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.
If you look at the crown/nape of this guys head (best represented in the first photo), you can see a dark pigmented area. Also, there is only 1 tail feather that is red (best represented in the 3rd photo), which is why I know its a red-tailed hawk. I know he is a "he" only because I saw him mating, so it was obvious he was a boy. I have photo'd him for more than 6 years so I fear his life left on earth won't be long, so every opportunity I get, I put in plenty of wait time in the field, because he is definately worth the patience it takes.
You can see other shots I've taken, by checking my labels for "white hawk" found on the right side of the template.











