I’ve worked out that from a cheap pack of foam shapes and two disposable latex gloves, you can make a bunch of bird whistles that cost a few pennies, or about 5 cents each.
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Endcard link for the bird whistle plans and help on the website : http://www.brainfoo.com/projects/how-to-make-a-bird-whistle/
Endcard link for my other projects : https://www.youtube.com/c/BrainfooTV
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WARNING!
This is built with small parts that when placed in the mouth could potentialy be a choking hazard to small children, so be safe and keep out of the reach. it’s also loud, I recorded well over 100 decibels.