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Extinct in the wild
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A species that is extinct in the wild (EW) is one that has been categorized by the International Union for Conservation of Nature as only consisting of living members kept in captivity or as a naturalized population outside its historic range. Classification requires exhaustive surveys conducted within the species' known habitat with consideration given to seasonality, time of day, and life cycle. Once a species is classified as EW, the only way for it to be downgraded is through reintroduction.
Extinct in the wild
Extinct in the wild
The Hawaiian crow has been listed as extinct in the wild since 2004.
The Hawaiian crow has been listed as extinct in the wild since 2004.
The Guam kingfisher has been extinct in the wild since 1986.
The Guam kingfisher has been extinct in the wild since 1986.
Przewalski's horse has been reintroduced, its status going from extinct in the wild to endangered.
Przewalski's horse has been reintroduced, its status going from extinct in the wild to endangered.
Critically Endangered
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An IUCN Red List Critically Endangered species is one that has been categorized by the International Union for Conservation of Nature as facing an extremely high risk of extinction in the wild. As of December 2023, of the 157,190 species currently on the IUCN Red List, 9,760 of those are listed as Critically Endangered, with 1,302 being possibly extinct and 67 possibly extinct in the wild.
Critically Endangered
Critically Endangered
Pygmy three-toed sloth, a species of sloth with a conservation status of Critically Endangered.
Pygmy three-toed sloth, a species of sloth with a conservation status of Critically Endangered.
The Beluga sturgeon (Huso huso) is an example of a critically endangered species. Their wild populations have been reduced due to overharvesting for i
The Beluga sturgeon (Huso huso) is an example of a critically endangered species. Their wild populations have been reduced due to overharvesting for its caviar.