Caspian lern (HYDROPROGNE CASPIA) illustrated by the von Wright brothers. Digitally enhanced from our own 1929 folio version… https://www.rawpixel.com/image/326276/free-illustration-image-von-wright-brothers-wright-birdFree Image from public domain licenseCaspian lern (HYDROPROGNE CASPIA) illustrated by the von Wright brothers. Digitally enhanced from our own 1929 folio version… https://www.rawpixel.com/image/326188/premium-illustration-psd-vintage-birds-america-ancientView license