https://creativecommons.org/publicdomain/zero/1.0/ https://www.rawpixel.com/image/325879 Coal Tit (Parus Ater) and Marsh Tit (Parus Palustris) illustrated by the von Wright brothers. Digitally enhanced from our own…

Coal Tit (Parus Ater) and Marsh Tit (Parus Palustris) illustrated by the von Wright brothers. Digitally enhanced from our own 1929 folio version of Svenska Fåglar Efter Naturen Och Pa Sten Ritade.

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