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https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/325890Boreal Owl, Tengmalm's Owl (Aegolius funereus) illustrated by the von Wright brothers. Digitally enhanced from our own 1929…Save

Boreal Owl, Tengmalm's Owl (Aegolius funereus) 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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