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Herman van der Meer ( www.xeno-canto.org )
A Green Woodpecker can sometimes cause confusion, because it does not always climb up a treetrunk. You can find the Green Woodpecker also sitting in the grass. It looks a bit like a strange green blackbird.
http://en.wikipedia.org/wiki/Picus_viridis
http://eol.org/pages/1177650/maps