This is accompanied by a soft hooting which is timed with the bobbing. They are a group of perching birds named for their bobbing or dipping movements. Dippers are named for their bobbing or dipping movements. So right away you're bobbing your head. They are named for their bobbing or dipping movements. Symptoms include lethargy, shortness of breath, tail bobbing, yellow-tinted droppings, and sudden death. During the fifth round, Frazier's timing and the rhythm of his bobbing and weaving improved. Courtship involves the male "head bobbing" to display dominance. One is bobbing, for which these particular individuals bounce their bodies. Arcee was bemused by Jack's demonstration of bobbing for apples. Changes in the pace of head bobbing are thought to be a form of communication.