Trees

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.