* Dippy Bird

- Water

- Glass of water

Procedure:

1. Fill the glass with water.

2. Place the Dippy Bird in the glass of water, making sure that the bottom of the bird is submerged.

3. Within 30-seconds to three minutes, the bird should start "dipping".

Explanation:

The Dippy Bird is a fun and popular novelty item that appears to be dipping its beak into a glass of water, over and over again. The key to the Dippy Bird's movement is the unique design of its head and the use of evaporation and condensation.

The bird's head is made hollow and has a small hole in the top, which allows air to enter and exit. When you place the Dippy Bird in a glass of water, the water will rise up into the bird's head through the hole. The bird's head then heats the water, which causes the water to evaporate.

As the water vapor rises, it pushes against the small hole in the top of the bird's head, creating pressure. This pressure causes the bird's head to tip over, and its beak dips into the water. When the bird's head dips into the water, the water cools down and condenses, creating a vacuum that sucks the water back up into the bird's head. This process repeats itself, causing the bird to continue "dipping" its beak into the water.