Two tall trees, a birch and a beech, are growing in the woods.
A small tree begins to grow between them.

The beech says to the birch: "Is that a son of a beech or a son of a
birch?"
The birch says it 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 and 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!"