I know this is off kinda off the subject for this forum or maybe it's not.....

When I a little kid (6 or 7) my grandfather took me out on his farm one day. He cut a small branch off a bush or tree on the land with his pocket knife. After a few minutes or working on it he made a whistle.

As best as I can remember it was about 4-5 inches long, he cut around the branch about 1 inch from one end and was able to pull the center out. So it looked like a dowel sticking out of the short end he had just cut around and a hollow branch for the rest. A couple of more cuts to the hollow piece and making a plug to put in the end to blow, voila, a whistle.

So what I am asking all the great people reading this forum is....

Does anybody know what kind of wood was used or could have been used? Has anybody ever heard of or seen a whistle made like this? Sadly my grandfather has moved on from this world and I cannot remember how to make this whistle. I would love to pass this knowledge on to my grandchildren one day soon, and to anybody else interested.

Thanks in advance for any replies.

Mike