It tells the adventurous story of a baby bird who, after falling out of his nest, wanders in search of his mother. Every creature (or object) he meets he asks "are you my mother?" and meets with negative responses. Finally, he asks a mechanical crane whether it is his mother and in response the crane picks him up and puts him back in his nest, thus reuniting him with his mother.
It is a gorgeous book and reminds me a little of Giblet's tale!