XXX- Clean Joke

It's hard to find a joke today without finding a dirty word or two in it,
but, here is one:

Two tall trees, a birch and a beech, are growing in the woods. One fine
day a small tree begins to grow between them, and the beech says to the birch,
"Is that a son of a beech or a son of a birch?" The birch says he cannot
tell.

Just then a woodpecker lands on the sapling. The birch says, "Woodpecker,
you are a tree expert. Can you tell if that is a son of a beech or a son
of a birch?"

The woodpecker takes a taste of the small tree. He replies, "It is neither
a son of a beech nor a son of a birch. It is, however, the best piece of
ash I have ever put my pecker into."