An RLI value of 0 equates to all species having gone Extinct. The full list of extinct species. BirdLife International has recommended PE become an official tag for Critically Endangered species, and this has now been adopted, along with a "Possibly Extinct in the Wild" tag for species with populations surviving in captivity but likely to be extinct in the wild (e.g.

The disappearance of 160 species has been declared by the IUCN over the last decade: most had been gone for a long time and their demise can be traced in large part to human impact.
See also. An example of a successful reintroduction of an EW species is Przewalski's horse, which as of 2018 is considered to be an Endangered species, following reintroduction started in the 1990s.

Some of these species are functionally extinct; as they are no longer part of their natural habitat and it is … Freshwater ecosystems and the animals they support are critical to providing clean water, food and livelihoods throughout Mexico. An RLI value of 1.0 equates to all species qualifying as Least Concern (i.e., not expected to become Extinct in the near future).
The International Union for Conservation of Nature … Spix's macaw). Many species have moved through several of the IUCN Red List categories—from least concern to vulnerable, endangered, critically endangered, and ultimately extinct. IUCN red list reveals wildlife destruction from treetop to ocean floor Latest list shows extinction now threatens a third of all assessed species, from monkeys to rhino rays Published: 18 Jul 2019 IUCN Red List of Threatened Species, also called IUCN Red List, one of the most well-known objective assessment systems for classifying the status of plants, animals, and other organisms threatened with extinction.

IUCN Red List extinct in the wild species for a list by taxonomy; Category:IUCN Red List extinct in the wild species for an alphabetical list Coral species are moving towards increased extinction risk most rapidly, while amphibians are, on average, the most threatened group. Twelve species have previously gone Extinct, and an additional eight are Extinct in the Wild, remaining only in captivity. Explore and discover Red List species ranges and observations Species listed under this status by IUCN are not known to have any living specimens in the wild, and are maintained only in zoos or other artificial environments.

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