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Periparus ater britannicus
This bird has an olive hue to its brownish-grey back plumage. It is 10–11.5 cm in length, and has a distinctive large white nape spot on its black head. The head, throat and neck of the adult are glossy blue-black, setting off the off-white sides of the face and the brilliant white nape; the white tips of the wing coverts appear as two wingbars. The underparts are whitish shading through buff to rufous on the flanks. The bill is black, the legs lead-coloured, and irides dark brown.
It is typically a bird of temperate humid conifer forest. I saw it just in the woods near the osprey observatory of Loch Garten.