I have a Great Tit visiting my feeder but it has quite a lot of white on it. I have a poor photo, still trying to get a better one however much of the tail feathers / back are now completely white and I wondered if anyone knew why?
An explanation here from the BTO ...
www.bto.org/.../leucism
2013 photos & vids here
eff37 on Flickr
Brilliant, thank you. I have submitted the details to their abnormal plumage survey too.