What is the nursery rhyme for 'UFO identified as a cow'?

There isn't a specific nursery rhyme for "UFO identified as a cow" as it is more of a humorous or fanciful concept. Nursery rhymes typically follow a more structured form with rhyming verses and a simple storyline, whereas the idea of a UFO being mistaken for a cow is more of a whimsical or imaginative scenario.