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.
The Somali hedgehog is a species of mammal in the family Erinaceidae. It is endemic to Somalia and Somaliland. The Somali hedgehog is nocturnal.
The pale gray shrew is a species of mammal in the family Soricidae. It is endemic to Pakistan and is distributed in the Shigar valley and the western edge of Deosai.
Epioblasma turgidula, the turgid blossom pearly mussel, turgid riffle shell, turgid-blossom naiad or turgid blossom, was a species of freshwater mussel, a mollusk in the family Unionidae. The US Fish and Wildlife Service declared the species extinct and delisted it from the Endangered Species Act in 2023.
Gibbus is an extinct genus of air-breathing land snails, terrestrial pulmonate gastropod molluscs in the family Streptaxidae.
Gonospira is a genus of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the subfamily Orthogibbinae of the family Streptaxidae.
Gonospira turgidula is a species of air-breathing land snail, terrestrial pulmonate gastropod mollusk in the family Streptaxidae, endemic to Réunion.
Streptostyla is a genus of predatory, air-breathing land snails, terrestrial pulmonate gastropod molluscs in the subfamily Streptostylinae of the family Spiraxidae.
Euglandina wani is a species of predatory, air-breathing, land snail, a terrestrial pulmonate gastropod mollusk in the family Spiraxidae. This species is endemic to Nicaragua.
A vulnerable species is a species which has been categorized by the International Union for Conservation of Nature as being threatened with extinction unless the circumstances that are threatening its survival and reproduction improve.
Gibberula turgidula is a species of very small sea snail, a marine gastropod mollusk or micromollusk in the family Cystiscidae.
Endangered species, as classified by the International Union for Conservation of Nature (IUCN), are species which have been categorized as very likely to become extinct in their known native ranges in the near future. On the IUCN Red List, endangered is the second-most severe conservation status for wild populations in the IUCN's schema after critically endangered. In 2012, the IUCN Red List featured 3,079 animal and 2,655 plant species as endangered worldwide. The figures for 1998 were 1,102 and 1,197 respectively.
