Drinking Bird / Dippy Bird Novelty Heat Engine Fake Perpetual Motion

The Drinking Bird also known as Dippy Bird is a retro novelty toy that is famous for its part of a episode in which main character Homer Simpson asks "Where's the any key?". This Drinking Bird will look like perpetual motion is happening, but it is only the thermodynamics and evaporation that make the bird dip back down again

- 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
- Process continues pretty much indefinitely
- Children are fascinated by the bobbing bird, and it's a good educational tool
- CAUTION: The fluid/dye inside the bird can permanently stain. Careful not to break the glass body