Early animals - extinction 2

When a type of animal is extinct, it is impossible to find it anywhere on the planet. For example, dinosaurs have become extinct, as well as the Derfil of the "Baiji" river, which has become extinct a few years ago in China. There are also many familiar animals that have become "very threatened with extinction" and we are afraid that the role in extinction will come to them. In this book, we revie...