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Critically endangered (CR) species face an extremely high risk of extinction in the wild. As of September 2016, the International Union for Conservation of Nature (IUCN) listed 581 critically endangered mollusc species, including 117 which are tagged as possibly extinct.
Critically endangered [ edit ] Rufous-headed hornbill ( Aceros waldeni ) Red-vented cockatoo ( Cacatua haematuropygia ) Philippine crocodile ( Crocodylus mindorensis ) Hawksbill sea turtle ( Eretmochelys imbricata ) Philippine eagle ( Pithecophaga jefferyi ) Philippine forest turtle ( Siebenrockiella leytensis ) Blue-winged racquet-tail ( Prioniturus verticalis )
This endangered status continued through several reassessments in 1986, 1988, 1990, and 1994 until it was upgraded in status to critically endangered in 1996. [1] Two petitions challenged its status as an endangered species prior to this, claiming the turtle (along with three other species) had several significant stable populations worldwide.
An IUCN Red List critically endangered (CR or sometimes CE) 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. [1] As of 2021, of the 120,372 species currently tracked by the IUCN, there are 8,404 species that are considered to be critically ...
The term threatened strictly refers to these three categories (critically endangered, endangered and vulnerable), while vulnerable is used to refer to the least at risk of these categories. [3] The terms can be used somewhat interchangeably, as all vulnerable species are threatened, all endangered species are vulnerable and threatened, and all critically endangered species are endangered ...
Based on the list of Australian animals extinct in the Holocene, about 33 mammals (27 from the mainland, including the thylacine), 24 birds (three from the mainland), one reptile, and three frog species or subspecies are strongly believed to have become extinct in Australia during the Holocene epoch.
Image of the Aral sea in 1989 (left) and 2014. The Aral sea is an example of a Collapsed (CO) ecosystem. [1] (image source: NASA)The Red List of Ecosystems was created to carry out assessments of biodiversity at a level of biological organization above species. [2]
