Equipment: A 'drinking bird' and a glass of water. Optional: a plexiglass box and a squeeze bottle containing alcohol. What it does: The bird bobs forward into the glass of water and recovers. It ...

The drinking bird is a heat engine driven by evaporating water absorbing heat from the surroundings. The bird bobs forward into the glass of water and recovers. It oscillates in the upright position ...

To Conduct Demonstration Ger the drinking bird to start bobbing by wetting its head and placing a 400mL beaker of water (spout toward the bird’s beak) adjacent to the bird to prevent it from turning ...

In fact, most small birds need to drink at least twice a day so being able to rely on a supply in your garden can make a big difference. Birds need water for drinking and their feathery ablutions ...