Which of the following books contains information on the population status of threatened species?

The Red Data Book is a conservation manual that includes a list of species that are endangered. It provides details on the status, distribution, and habitat of these species in order to concentrate conservation efforts and increase awareness of their declining numbers. The book is often published by national or international organisations, such the International Union for Conservation of Nature, and is periodically updated to reflect changes in species populations and status (IUCN).