When children think about prehistoris life, they think about dinosaurs but tiny creatures were also an essential part of early life, so this book gives an interesting new perspective. Hundreds of millions of years before humans, our planet was already teeming with an amazing variety of life. Imagine - giant sea scorpions as big as a lion, enormous millipedes. Fact files give more details about each. The illustrations are an outstanding feature of this book - full page, detailed and colourful, they really do give an excellent imnpression of these creatures and the world they inhabited.