Edward Julius Detmold and his twin brother Charles Maurice Detmold were book illustrators active in the “Golden Age” of illustration in the late 19th and early 20th centuries.
Both were interested in natural history and animals, and even in their illustrations for books like Kipling’s The Jungle Book and The Fables of Aesop, their images were more likely to feature animals than people.
Both worked in watercolor and ink and were influenced by Japanese Prints, Art Nouveau and the Pre-Raphaelite painters as well as their contemporary illustrators.
I can’t find as much information about Charles, so I’ve focused here on Edward Detmold, and the images shown are (as far as I can determine) by Edward.