Takahe bird, swamphen, New Zealand wildlife. Original public domain image from Flickr https://www.rawpixel.com/image/8752658/photo-image-tree-public-domain-greenFree Image from public domain licenseFour sections of diseased intestines, numbered for key. Coloured lithograph by Batelli after Ottavio Muzzi, c. 1843. https://www.rawpixel.com/image/13963928/image-cartoon-art-patternFree Image from public domain licenseOriginal public domain image from Flickr https://www.rawpixel.com/image/4026515/original-public-domain-image-from-flickrView licenseDissections of two animal stomachs: one ruminant, the other non-ruminant. Etching, 1823. https://www.rawpixel.com/image/13990773/image-cartoon-art-clothingFree Image from public domain licenseTimber RattlesnakePhoto by Grayson Smith/USFWS. Original public domain image from Flickr https://www.rawpixel.com/image/4029137/photo-image-nature-snakeFree Image from public domain licenseSpider close up in nature, animal photography. Free public domain CC0 image. https://www.rawpixel.com/image/6022460/photo-image-public-domain-green-natureFree Image from public domain licenseSilhouette birds perched on tree branch, backed by a light blue sky with pick, sun-kissed clouds at sunrise-or-sunset in… https://www.rawpixel.com/image/3296044/free-photo-image-agelaius-animal-architectureFree Image from public domain licenseBull moose near Pebble Creekby Jacob W. Frank. Original public domain image from Flickr https://www.rawpixel.com/image/4038523/photo-image-landscape-horseFree Image from public domain licenseA variety of sea creatures. Coloured etching by F. Guimpel after E. Bommer. https://www.rawpixel.com/image/14005530/variety-sea-creatures-coloured-etching-guimpel-after-bommerFree Image from public domain licenseBlack-crowned Night-Heron - Immature, NPSPhoto, R. Cammauf. Original public domain image from Flickr https://www.rawpixel.com/image/4033812/photo-image-plant-bird-natureFree Image from public domain license