An Innovative twist to the Original Drinking Bird, the scientific novelty that has been around since the 1960's! The T. rex bobs his head into a glass of water over and over without continuous stimulation. When the Tyrannosaurus rex is in motion, he mimics a perpetual motion machine, but he is actually just a simple example of an evaporation heat engine.
Measures approximately 8" tall.
Please note this product is not intended for use by children under age of 8.