Five little blue birds...

Five little blue birds, hopping by my door
One went to build a nest, and then there were four.
Four little blue birds singing lustily
One got out of tune, and then there were three
Three little blue birds, and what should one do,
But go in search of dinner, leaving only two.
Two little blue birds singing for fun
One flew away, and then there was one.
One little blue bird sitting in the sun
He took a little nap, and then there was none.
- Children's Nursery Rhyme