Crow curiosities: what causes white feathers?

At a recent field site in Bellevue, one of my regular visitors was the most fantastically leucistic crow I had ever seen.  Naturally, I dubbed him or her "ZB" for Zebra Bird.  One or two white feathers is pretty common but this was something far more spectacular.  Something that, to the naive observer, may look like…

File:Crow with some white feathers - 5.jpg - Wikimedia Commons

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