4An exciting journey of science discovery is as near as your own backyard. Just one small square is alive with creepers and crawlers, lifters and leapers, singers, buzzers, climbers, builders, and recyclers. Backyard invites children ages 7 and up to become nature lovers by looking, listening, touching, and smelling the world from the ground up! From the unique One Small Square series of science acitivity books. . .where children can explore exotic and familiar ecosystems in detail, one small square at a time.