User:Stanakin/sandbox

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Extinct in the wild
A species that is extinct in the wild is one which has been categorized by the International Union for Conservation of Nature (IUCN) as only known by living members kept in captivity or as a naturalized population outside its historic range due to massive habitat loss. A species is declared extinct in the wild after thorough surveys have inspected its historic range and failed to find evidence of a surviving individual.

Possibly extinct
Extinction of taxa is difficult to detect as long gaps without a sighting is not definitive. Some mammals declared as extinct may very well reappear. For example, a study found that 36% of purported mammalian extinction had been resolved, while the rest either had validity issues (insufficient evidence) or had been rediscovered. As of December 2015, the IUCN lists 30 mammalian species as "critically endangered (possibly extinct)".