Thanks Malcolm, although the one I spotted was up near Cumbria, this one that Doggie spotted was Yorkshire so it seems to be a widespread case!? Interesting about the caterpillars though!
Just been told that the yellow colouring comes from carotens which Great Tits get from caterpillars. Since Great Tits are residents and not migrants that would indicate a local cause of lack of caterpillars. No idea what may have caused that over in Yorkshire but here we had 3 huge forest fires last June which destroyed hundreds of thousands of acres of montane forest and everything which lived there.
Hey doggie, nice spotting! just round the corner from me! could you please join my birds of britain mission using the following link and add this and any subsequent spottings to it please?
http://www.projectnoah.org/missions/22362154
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