It's one of the many things the hub shared with the mini's on our camping trip...more pics of the cool caverns later coz those deserve their own story!
finding the right acorn cap is important
display proper technique...it's all in the cheeks
okay, the way you hold the acorn cap is important too
Be sure you make the 'y' with your thumbs...
Much to the dismay of his older brother...middleson's favorite activity was acorn whistling!
He even taught his sister!