[wisb] Leucistic Am. Goldfinch - Langlade Co.

I had an interesting visitor to my  feeders this morning. A male American
Goldfinch that was white everywhere that ought to be yellow. Wings, cap and
eye were black. Bill was pink. It appeared to be still moulting - there were
a few patches of drab gray brown across the upper back. So my question -
what's happening with this bird? It appears to have moulted from a normally
colored winter plumage to white. Any ideas? Is this genetic? environmental?

Nancy Richmond
Polar - Langlade Co.

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