Read and discover more about the animal life cycles. There are millions of different species of animal in the world. Taking into account animal features, scientist have classified them. The two main groups of animals are vertebrates and invertebrates. At the same time, this groups have plenty of divisions which you can discover through the reading of this book. You will also learn about animal actions like breeding, growing up, finding mate, keeping safe, having babies and taking care of them. Also enjoy the colour photos of real animals.