Each spread in this book illustrates one animal in detail. An eight-year-old child is included in the illustration to give the animals a sense of scale. A scale box gives an idea of their size in comparison to each other. The great diversity of the animal kingdom is the starting point of the book. The book illustrates how fast a cheetah can run, how quickly a falcon can dive and what part of a chameleon is still one moment and sprints out to kill its prey a second later. It questions whether a sloth moves at all and why some animals have to be slow to survive or fast to go in for the kill.

Each spread in this book illustrates one animal in detail. An eight-year-old child is included in the illustration to give the animals a sense of scale. A scale box gives an idea of their size in comparison to each other. The great diversity of the animal kingdom is the starting point of the book. The book provides the answers to questions about the biggest animals in the sea, the size of the smallest humming-bird, the biggest animal on the land and the size of the smallest kangaroo in the world. It also provides information about the amazing shapes, sizes, lengths and weights of animals all over the world.

In answer to the questions about how long animals can live, or what counts as a long life this book on short-lived and long-lived animals is written by an international zoo specialist, and shows animal comparisons and the diversity of animal life. It reveals for instance how a mayfly, lives for only one day, and the tiny deep-sea clam can live for a hundred years.