We make a whistle from an aluminum can and two bottle caps. Simple and fun homemade.
I consider it unnecessary for you to explain something, since everything is clear from the pictures. But I want to remind you about safety when working with sharp edges of the can. Be careful: sharp edges cut fingers for one or two, so do all the details with protective gloves.
Everything is perfectly cut with ordinary scissors.
For reliable connection, glue the whistle with hot or ordinary glue.
You can place a ball on the whistle to complete the melody. The ball can be replaced with a regular dry pea.
Whistle for health!