Physics Drinkling Bird Activity Purpose: To study the relationship between heat transler and mechanical energy. Procedure: Caretully observe the drinking cycle of the bied of several minutes. Analysis: Describe in detail (4-5 sentences) how the drinking bird works. Why is the head covered with a porous material? What pushes the liquid up the tube? Why does the liquid go back down the lube? What is the source of energy for the bird's motion?