Oken’s Allgemeine Naturgeschichte by Lorenz Oken, published in 1843, a lithograph of pied avocet and oystercatcher.… https://www.rawpixel.com/image/431487/free-illustration-image-flamingo-bird-animalsFree Image from public domain licenseOken Eggs - taf. 6 (1843) by Lorenz Oken (1779-1851), a collection of different eggs of different species of birds.… https://www.rawpixel.com/image/431481/free-illustration-image-egg-engraving-lithographFree Image from public domain licensePied avocet and oystercatcher vintage illustration by Lorenz Oken. Digitally enhanced by rawpixel. https://www.rawpixel.com/image/2267128/premium-illustration-image-vintage-oken-wedding-posterView licenseCollection of different eggs of different species of birds vintage illustration by Lorenz Oken. Digitally enhanced by… https://www.rawpixel.com/image/2267051/premium-illustration-image-bird-eggs-chromolithographView licenseLorenz Oken [Okenfuss]. Stipple engraving by J. Rosmaesler, senior after J. W. C. Roux. https://www.rawpixel.com/image/13971708/image-cartoon-face-personFree Image from public domain licenseLorenz Oken [Okenfuss]. Line engraving by M. Steinla after J. W. C. Roux. https://www.rawpixel.com/image/13999326/lorenz-oken-okenfuss-line-engraving-steinla-after-rouxFree Image from public domain license