Vapor Pressure: Drinking Bird

A novelty store "Drinking Bird" repeatedly dips is beak into a beaker of water and then bobs back to an upright position. Visible movement of a liquid in the bird's body accompanies the bobbing; the movement is caused by changing vapor pressure of the liquid due to different temperatures at the bird's head and the bird's body.
Drinking Bird Introduction   
(Movie/Animation (1))
Drinking Bird: Effect of heat   
(Movie/Animation (1))
Drinking Bird: Effect of Water   
(Movie/Animation (1))
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