... this bird drinking almost forever. Evaporative cooling, Boyle's gas laws, and gravity. Three main principles of ... this bird drinking almost forever. Evaporative cooling, Boyle's gas laws, and gravity. Here is how the ... up.When liquid evaporates from the Drinking Bird's fuzzy head, the head cools down, which ... Bird top-heavy. Now the Drinking Bird get's thirsty. Liquid travels to the head. The bottom ...