Ages 4 to 7 years. Grouping and classification are among the first math and science skills that children need to learn. This fun book will challenge children to observe natural creatures to see what makes them the same and different. It presents a much more interesting way of looking at objects because the objects may not be exactly the same. For example, birds have two wings, but the wings of different birds may not look similar.Kalman, Bobbie is the author of 'Is It the Same or Different?', published 2007 under ISBN 9780778733379 and ISBN 0778733378.