This is a vintage illustration of a yellow-footed rock-wallaby (Petrogale xanthopus). The wallaby is depicted in a cave-like setting, with a rough, textured rock wall forming the backdrop. The animal is a light grey-brown color, with a reddish-brown patch on its shoulder and a long, curved tail. It has a small, pointed face with dark eyes and a pink nose. A small sprig of green plant life is visible near the bottom of the image. The illustration is detailed and realistic, with careful attention paid to the texture of the animal's fur and the rocky surface of the cave. The text 'PETROGALE XANTHOPUS' is written at the bottom of the image. The style of the illustration suggests it is from a natural history publication or a scientific study.