A gentle, sweetly illustrated concept book takes on physical forces as young children learn about pushing and pulling. It's time for Bird to build her nest Follow her as she pulls a worm out of the ground, lifts some twigs that are just the right size, and pushes the twigs into place. Uh-oh One of the twigs falls to the ground But after a day of hard work, Bird's nest is ready and waiting. Can you guess what it's waiting...