A gatling of Gila Woodpeckers
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 beak in.'
Edit: replaced the picture of three with this one of four...