This picture book cunningly incorporates ideas about the science of forces into an appealing story about a bird building her nest. As a new day begins, Bird first finds something to eat and tries to pull a big worm out of the ground. Eventually, she settles for a smaller and less strong worm for her meal. As Bird begins to work on her nest, she gathers twigs. Some are too heavy, others she can carry one or two of and still smaller ones she can carry three or four twigs. She pushes and pulls the twigs into place. Then she gathers lighter and softer things to line her nest for the eggs that are about to arrive.

The concepts of pushing and pulling, dropping and lifting, heavy and light are very nicely portrayed in this picture book. The story reads aloud well and is a great introduction to the concepts as well as a good book to share. The illustrations are bold and bright, so they will work well when shared with a group. A nice one to share in the spring, this picture book intelligently uses science to tell a story. Appropriate for ages 2-4.