Why are Green Woodpeckers so uncooperative? One day I'll get a decent photograph...
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What I have noticed is that, if the greens see something out of the ordinary, they will scoot to an opposite side of the tree in an attempt to hide.
I think your photo shows the moustache well enough to say that its a female g w - no red stripe on the moustache. ( nice shot of the lichen btw ! )
Lat/Lng: 52.29034, -0.33091
OS grid ref: TL139671