haunch

But I had no time to pursue these reflections; for the gray horse came to the door, and made me a sign to follow him into the third room where I saw a very comely mare, together with a colt and foal, sitting on their haunches upon mats of straw, not unartfully made, and perfectly neat and clean.

Now these are the Laws of the Jungle, and many and mighty are they; / But the head and the hoof of the Law and the haunch and the hump is—Obey!