“The Hippopotamus.” Mid 19th c. Collections of the Australian Museums, Sydney. Image © 2020 The Australian Museum. Fair use license. via https://australianmuseum.net.au/learn/collections/museum-archives-library/john-gould/josef-wolf-1820-1899/
“A Lion before the Pyramids.” 19th c. Pencil, pen and ink and watercolor. Image ©2020 Artnet Worldwide Corporation. Fair use license. via http://www.artnet.com/artists/josef-wolf/a-lion-before-the-pyramids-3cD3CijkWwiuF7a_tYVg4A2
“A Polar Bear hunting Seal in the Arctic.” 19th c. Watercolor on brown paper. Signed “J Wolf” on the lower right. Image © CHRISTIE’S 2020. Fair use license. via https://www.christies.com/lotfinder/Lot/josef-wolf-1820-1899-josef-wolf-1820-1899-2777842-details.aspx