Why isn’t a drinking bird perpetual motion?
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What makes it dip is a change in temperature caused by external energy. It’s not moving on its own, although it appears that way at first.
What’s actually happening is there is some clever use of pressure and heat, when the bird dips it’s beak, the felt or whatever on the end gets wet and cools the vapor in the head of the bird into liquid, which more draws liquid up towards the head, making it dip again, then when it’s horizonal the pressure equalizes and the liquid moves yet again to tilt the bird back upright.
Without evaporation of the water on its beak, the liquid/vapor inside won’t change, at least not in the way we want it to.
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