A book with impressive illustrations to discover the extinct animals that once populated the Earth. The Earth is constantly changing. Continents move, the sea rises and falls, the climate becomes warm or very cold, volcanoes erupt, asteroids fall… Living beings also change and evolve. Only the best adapted to the place they inhabit survive, the rest become extinct and their place is taken by others. That is called natural selection. In this book we remember the animals that lived before us, some for millions of years longer than Homo sapiens has been populating our precious planet, and that no longer exist. We remember what they were like, how they lived, and the possible causes of their extinction.