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This is a sparrow sized tit, one of the largest (if not the largest) tits in Palearctic, with some 15 cm in length. It has a black head with white cheeks, olive-green back with blue to greyish-olive mantle, and a horizontal white stripe on wing covers. It sports strikingly yellow chest and belly, with a black stripe in the middle.
Observed in groves of Botanical Garden in Geneva, shores of Geneva lake.