Two tall trees, a birch and a beech, are growing in the woods. 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 in."