Hare (or Field Rabbit), by Albrecht Durer.
Watercolor and bodycolor, roughly 10 x 8″ (35 x 22 cm).
Wow.
Stunning mastery of water media, and one of the most clear, focused and beautiful examples of artistic observation I’ve ever seen.
On Google Art Project. Click on the image for zoom controls.
Original is in the Albertina, Vienna.