I've just seen a couple of photos of a brood of five Cygnets and two are white,they say it's from a Polish gene, how common is this?
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Tony
My Flickr Photostream
I don't want to post photos direct because they are not mine, but I may pop down at some point and get some.
Doubtful if this will post but you can find examples by googling it. www.birdguides.com/.../
2013 photos & vids here
eff37 on Flickr