This 1872 Currier and Ives print is titled The Puzzled Fox: Find the Horse, Lamb, Wild Boar, Men's and Women's Faces. There are eight human and animal faces hidden in the scene. Can you find them?
Ironically, the birds in the upper left have now disappeared — they're passenger pigeons.
Menagerie via Futility Closet where you can find all sorts of puzzles and other neat stuff.