Common Rabbit Postures, Behaviors, and Vocalizations Purring or tooth purringA sound made by lightly and quickly grinding and vibrating the teeth as the whiskers quiver; a sign of contentment. Oinking or honkingA What Does It Mean When Rabbits Thump? PBS Pet Travel Rabbit Behavior Explained: Why They Thump, Flop, and Zoom Small Pet Select U.S. Our old bunny bacon did something weird yesterday. We were hanging out and his butt started vibrating VERY fast. Kept doing that as he stretched out. few seconds later he stopped and I was petting my bunny, just petting and holding his ears gently in my hand while stroking it, and he vibrated around his head area??? : r Rabbits Why Is My Rabbit Shaking? Causes & Emergency Signs