In which book endangered species are listed?

Endangered species are officially listed in the Red Data Book, a comprehensive public document created and maintained by the International Union for Conservation of Nature (IUCN). This book catalogs species according to their extinction risk status, using scientifically established categories: Extinct, Extinct in the Wild, Critically Endangered, Endangered, Vulnerable, Near Threatened, Least Concern, and Data Deficient. The Red Data Book provides detailed information about each listed species, including population sizes, geographical distribution, habitat requirements, major threats, and conservation measures needed to prevent extinction.

The Red Data Book serves as the world's most authoritative inventory of the conservation status of plant and animal species, guiding conservation priorities and policy decisions globally. Different countries also maintain their own national Red Data Books to track species within their borders. The IUCN regularly updates these listings based on new scientific data and population assessments—species may move between categories as their status improves or deteriorates. For instance, species like the giant panda have been downlisted from Endangered to Vulnerable due to successful conservation efforts, while others have moved to more threatened categories. This documentation is crucial for focusing conservation resources, implementing protective legislation, raising public awareness, and monitoring the overall health of global biodiversity.