White blackbirds

["Peter Shute (NUW)" <>]

I've recently been seeing a blackbird with some white tail feathers, here in 
Altona, Melbourne. I've also seen a couple of blackbirds over the last 20 
years or so that were all white.  At least they looked, acted and sounded 
like blackbirds.  How common are these variations?
Peter Shute 

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