The Red List Index of species survival:

What is the long-term impact of Durrell’s conservation programmes on its target species’ chances of survival?

Red List Index of Species Survival
Red List Index of Species Survival
mauritius kestrel mallorcan midwife toad narrow striped mongoose rodrigues fody echo-parakeet rodrigues warbler mauritius fody pink pigeon malagasy giant jumping rat golden lion tamarin black lion tamarin madagascar-teal meller's duck rodrigues fruit bat olive white eye alaotran gentle lemur pygmy hog +67% with Durrell intervention -23% without Durrell intervention
Red List Index of Species Survival
pygmy hog alaotran gentle lemur olive white eye rodrigues fruit bat meller's duck madagascar-teal black lion tamarin golden lion tamarin malagasy giant jumping rat pink pigeon mauritius fody rodrigues warbler echo-parakeet rodrigues fody narrow striped mongoose mallorcan midwife toad mauritius kestrel
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Changes in the chances of Survival

Mauritius kestrel

The Red List Index (RLI) measures the impact of Durrell’s conservation work.

It compares the way the overall extinction risk of 17 of its target mammal, bird and amphibian species has changed to a theoretical scenario in which conservation has not taken place. The RLI measures changes in the chances of survival of each species by tracking its movement over time through IUCN Red List categories of extinction risk. These categories are assigned by independent experts who follow the rigorous and authoritative IUCN Red List assessment process. Eight of Durrell’s target species have moved into lower Red List categories since 1988 – six Mauritian birds, the Golden Lion Tamarin and the Mallorcan Midwife Toad – meaning their numbers have significantly increased and therefore their risk of extinction decreased.

Durrell Madagascar team

This has driven a striking upward trendin the RLI, demonstrating that Durrell’s programmes are moving many species away from extinction. Without conservation efforts, some of these species would almost certainly have gone extinct in the wild, and overall our species would have been in far worse shape than they are today.

A 2010 scientific paper in a world-leading journal showed that, at a global level since the 1980s, 63 mammal, bird and amphibian species have moved down the Red List because of conservation.

That means Durrell and its partners have led or contributed to more than 10% of these globally significant improvements in the status of species.