This release of the album is dedicated to mammals threatened with extinction. On its pages are presented all types of animals included today in the Red Book of the USSR. The reader learns about their distribution and features of biology, about the reasons that played a fatal role in their fate, as well as about what types of animals are included in the Red Book of the International Union for Conservation of Nature and Natural Resources. Particular attention is paid to the measures that are being taken in our country and abroad to prevent the impoverishment of the world of animals. Designed for a wide range of readers.