Red Data Book
The IUCN (International Union for the Conservation of Nature and Natural Resources) maintains an international list, published as the Red Data Book.
Red Data Book species are classified into different categories of perceived risk. Each Red Data Book usually deals with a specific group of animals or plants (for instance, reptiles, insects or mosses).
The original IUCN Red Data Book threat categories have been widely applied to hundreds of thousands of taxa of animals, plants, and fungi.