There are two trees in the forest. They are very proud trees. One day they notice a sapling half-way between them. One tree proclaims,
"That is a son of beech!" "No, that is a son of a birch!" insists the other.
"A son of a BEECH!"
"A son of a BIRCH!"
"Son of a beech!"
"Son of a birch!"
The fighting attracts a woodpecker who informs them that he can tell what kind of tree the sapling is by its taste. First he tastes the beech and the birch. Then he tastes the sapling.
"Well now, is that a son of a beech or a son of a birch?" asks the beech.
"You're both wrong!" says the bird. "That's the best piece of ash I've had my pecker in for a long time."