IUCN Red List – Wikipedia

The International Union for Conservation of Nature (IUCN) Red List of Threatened Species (also known as the IUCN Red List or Red Data Book), founded in 1964, is the world’s most comprehensive inventory of the global conservation status of biological species.It uses a set of criteria to evaluate the extinction risk of thousands of species and subspecies.

https://en.wikipedia.org/wiki/IUCN_Red_List