Minecraft wiki entry for Mule, associated text: All mules roam idly, occasionally stopping to rear, swish their tails, or lower their heads as though eating the grass. Unlike sheep, the eating animation does not actually cause any grass to be consumed. Mules turn to look at any player that comes near. Any mule, even a wild one, allows itself to be attached to a lead without protest. However, if the player attempts to saddle an untamed mule, it rears and flails its front hooves.