The Stone Hatchlings by Sarah Tsiang
A child's imagination takes flight. When Abby finds two warm, round stones in the backyard, she "adopts" them, pretending they're unhatched birds. She lovingly builds them a cozy nest and watches over them constantly until one day she imagines that with a crick and a crack, the stones hatch to reveal two gray chicks. With a flourish of her paintbrush, Abby colors the birds yellow, blue, and green, and proceeds to take excellent care of them. Then the make-believe birds stop singing. Soon they also stop eating, and when they start to lose their feathers Abby realizes it is time to let them go. She waves goodbye as they fly off. But every morning, two new birds appear at the window and sing to Abby. As in their bestselling book, A Flock of Shoes, this gifted author-illustrator team captures perfectly the whimsical imagination of a small child for whom anything is possible.