name the international organisation that documents the extinction of species

It is the International Union for Conservation of Nature and Natural Resources (IUCN).
It has published the Red List of Threatened Species which assesses the conservation status of the world.

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The (IUCN) Red List of Threatened Species (also known as the (IUCN) Red List or Red Data List), 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.........
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