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vul·ner·a·ble species

A Vulnerable species is one which has been categorized by the International Union for Conservation of Nature as likely to become Endangered unless the circumstances threatening its survival and reproduction improve. There are currently 4728 animals and 4914 plants classified as Vulnerable, compared with 1998 levels of 2815 and 3222, respectively. Vulnerability is mainly caused by habitat loss or destruction. Vulnerable species are monitored and are becoming threatened. However, some species listed as "vulnerable" may in fact be quite abundant in captivity, examples being the blue poison dart frog. According to the IUCN they use several criteria to enter species to this Vulnerable category. A taxon is Vulnerable when it is not Critically Endangered or Endangered but is facing a high risk of extinction in the wild in the medium-term future, as defined by any of the following criteria: A Population reduction in the form of either of the following: 1 An observed, estimated, inferred or suspected reduction of at least 20% over the last 10 years or three generations, whichever is the longer, based on any of the following: a direct observation b an index of abundance appropriate for the taxon

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