Olive Ridley turtle hatchlings

IUCN Red List process

Red List Index

The IUCN Red List Index

Red List Indices have been produced which chart overall changes in the threat status of the world's amphibians, birds, corals and mammals. These are based on the number of species that moved between categories as a result of genuine changes in threat status (excluding moves resulting from improved knowledge or taxonomic changes). The IUCN Red List Programme will improve the taxonomic coverage of the Red List Indices in the coming years as they are central to monitoring the progress of global efforts to reduce biodiversity loss.

IUCN Red List Assessor workshop, April 2011

Criteria review process

search for species
  • IUCN Red List Logo
The Starting Point for Conservation Acion
  • Pygma Slow Loris (Nycticebus pygmaeus) Vulnerable
Support the Red List 50 campaign
  • Donate to IUCN Red List
Red List Publications