WORLD FAMOUS Joke Dippy Sipping Drinking Buddy Bird Watcher Nest House Feeder

WORLD FAMOUS Joke Dippy Sipping Drinking Buddy Bird Watcher Nest House Feeder A rather silly looking 6" bird with a felt covered head and has plastic feet. Worse, he cannot get his fill of water. You buy the drinks.. Fluid inside condenses from the evaporative cooling of the water off the bird's beak, making it top heavy and dunking it back into the water. The condensate rejoins the liquid pool in the bird's bulb, and he tips up again.. Depending on where you live, you may see this toy called a drinking bird, sipping bird, sippy bird, dippy bird or insatiable birdie. All versions of the toy are based on a heat engine in order to function. Evaporation of a liquid from the bird's beak lowers the temperature of the head of the toy. The change in temperature creates a pressure differential inside the body of the bird, which causes it to perform mechanical work (dip its head). A bird that dips its head into water will keep dipping or bobbing as long as water is present. In fact, the bird works as long as its beak is damp, so the toy continues to function for a span of time even if it is removed from the water. Wet the head and beak of the bird with cold water. The bird will sway back and forth. A cup of cold water can be placed under the bird’s beak to keep the beak moist and to simulate drinking. The bird can also function without a cup of water.