The life-cycles of different animals and insects can differ greatly. In this book kids will discover how eggs develop into mature animals and the fascinating range of changes they may undergo in the process. Readers will learn the life-cycle of a frog, a bird, a butterfly, a bee, a mouse, and a sheep. Some mammals change very little during their life-cycle in this book we learn how insects and amphibians undergo many changes. The book includes critical thinking questions, activities and experiments, and it is supported with downloadable worksheets.