extinct,exasdefinedbytheiucn

,Aleast-concernspeciesisaspeciesthathasbeencategorizedbytheInternationalUnionforConservationofNature(IUCN)asevaluatedasnotbeinga ...,Endangeredspecies,asclassifiedbytheInternationalUnionforConservationofNature(IUCN),arespecieswhichhavebeencategorizedasverylikelyto ...,WhendiscussingtheIUCNRedList,theofficialtermthreatenedisagroupingofthreecategories:criticallyendangered,endangered,andvulnerabl...

參考資訊如下
IUCN categories

Least

A least-concern species is a species that has been categorized by the International Union for Conservation of Nature (IUCN) as evaluated as not being a ...

Endangered species (IUCN status)

Endangered species, as classified by the International Union for Conservation of Nature (IUCN), are species which have been categorized as very likely to ...

Conservation status

When discussing the IUCN Red List, the official term threatened is a grouping of three categories: critically endangered, endangered, and vulnerable. Extinct ...

Instructions for Using Models to List Species as EX or CR(PE)

Extinct (EX) and Critically Endangered (Possibly Extinct) (CR(PE)) on the IUCN Red List. These methods also apply to determining whether a species is ...

Summary Statistics

Possibly Extinct species. The number of recent extinctions documented by the Extinct (EX) and Extinct in the Wild (EW) categories on The IUCN Red List is ...

Frequently Asked Questions

Species in the Vulnerable, Endangered and Critically Endangered categories are collectively described as 'threatened'. The IUCN Red List does not include Not ...

IUCN Red List of Threatened Species

The IUCN Red List Categories and Criteria are intended to be an easily and widely understood system for classifying species at high risk of global extinction.

IUCN

... Endangered, Endangered and Vulnerable) are outlined below. EXTINCT (EX). A species is Extinct when there is no reasonable doubt that the last individual has ...