Comparison of Red list classes above
and NatureServe status below
A vulnerable species is a species which has been categorized by the International Union for Conservation of Nature as likely to become endangered unless the circumstances that are threatening its survival and reproduction improve.
Vulnerability is mainly caused by habitat loss or destruction of the species home. Vulnerable habitat or species are monitored and can become increasingly threatened. Some species listed as "vulnerable" may be common in captivity, an example being the military macaw.
There are currently 5196 animals and 6789 plants classified as vulnerable, compared with 1998 levels of 2815 and 3222, respectively.Practices such as Cryoconservation of animal genetic resources have been enforced in efforts to conserve vulnerable breeds of livestock specifically.
The International Union for Conservation of Nature uses several criteria to enter species in this 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 to E):
A) Population reduction in the form of either of the following:
B) Extent of occurrence estimated to be less than 20,000 km2 or area of occupancy estimated to be less than 2000 km2, and estimates indicating any two of the following:
C) Population estimated to number fewer than 10,000 mature individuals and either:
D) Population very small or restricted in the form of either of the following:
E) Quantitative analysis showing the probability of extinction in the wild is at least 10% within 100 years.
The examples of vulnerable animal species are hyacinth macaw, mountain zebra, gaur, black crowned crane and blue crane
Sanzinia madagascariensis,also known as the Malagasy tree boa, or Madagascar tree boa) is a non-venomous boa species endemic to the island of Madagascar. It was considered conspecific with the Nosy Komba ground boa.
Montivipera albizona, the central Turkish mountain viper, is a venomous viper species endemic to the mountainous regions of central Turkey. No subspecies are currently recognized.
Macrovipera schweizeri is a species of venomous snake in the family Viperidae. The species is endemic to the Cyclades Archipelago in the Aegean sea. No subspecies are currently recognized.
Vipera kaznakovi is a species of venomous snake in the subfamily Viperinae of the family Viperidae. The species is endemic to Turkey, Georgia, and Russia. No subspecies are currently recognized.
Montivipera latifii is a species of venomous snake in the subfamily Viperinae of the family Viperidae. The species is endemic to Iran. There are no subspecies that are recognized as being valid.
A critically endangered (CR) species is one that has been categorized by the International Union for Conservation of Nature (IUCN) as facing an extremely high risk of extinction in the wild.
Crotalus unicolor is a venomous pitviper species found only on the Caribbean island of Aruba, off the coast of Venezuela. Critically endangered, it is estimated that fewer than 230 adults survive in the wild. It is sometimes still classified as a subspecies of Crotalus durissus.
The blue-headed macaw or Coulon's macaw is native to eastern Peru, north-western Bolivia, and far western Brazil. It has a total length of about 41 cm (16 in), making it a member of the group of smaller macaws sometimes known as the mini-macaws, which includes any species of macaw with a total length of 50 cm (20 in) or less. As in all macaws, its tail is long and pointed and the bill is large and heavy.
The Warner sucker is a rare species of freshwater ray-finned fish in the family Catostomidae. Native to Oregon in the United States and found only in the Warner Basin, its distribution extends just into Nevada and California. It is a federally listed threatened species. Its other common name is redhorse. The International Union for Conservation of Nature has rated this fish as an endangered species because of its small extent of occurrence, the small number of locations in which it is found, and the extreme fluctuations in area of occupancy resulting from drought and water abstraction. Conservation efforts have been put in place.
Pseudophoxinus drusensis, also known as the Drusian spring minnow, is a species of ray-finned fish in the Cyprinidae. Currently the species is known from 2-3 locations of Israel and has not been found during a survey in Syria. Its natural habitats are rivers, intermittent rivers, and freshwater marshes. It is threatened by habitat loss. In 2006 the species was assessed as endangered as it was estimated that the total population had declined by at least 50% between 1995 and 2006. It feeds on plants and small animals and spawns between April and June. It is believed to still be in decline, the area of occupancy is estimated to be less than 500 km², and the extent of occurrence estimated to be less than 5,000 km². It is therefore again assessed as Endangered.
The cave squeaker is a species of frog in the family Arthroleptidae. It is endemic to the Chimanimani Mountains in Zimbabwe.
The white-headed saw-wing, also known as the white-headed rough-winged swallow is a species of bird in the family Hirundinidae. It is found in Angola, Burundi, Democratic Republic of the Congo, Ethiopia, Kenya, Malawi, Rwanda, South Sudan, Tanzania, Uganda, and Zambia.
Bothrops pirajai is a species of venomous snake, a pit viper in the subfamily Crotalinae of the family Viperidae. The species is endemic to Brazil. There are no subspecies that are recognized as being valid.
Calaby's pademelon, also known as the alpine wallaby, is a species of marsupial in the family Macropodidae. It is endemic to Papua New Guinea. Its natural habitats are subtropical or tropical dry forests, dry savanna, subtropical or tropical dry shrubland, and subtropical or tropical dry lowland grassland. It is threatened by habitat loss.
Bothriechis aurifer is a venomous pit viper species found in Mexico and Guatemala. No subspecies are currently recognized.
Monachoides vicinus is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Hygromiidae, the hairy snails and their allies.
The Cantabrian capercaillie is a subspecies of the western capercaillie in the grouse family Tetraonidae. It is one of two subspecies found in Spain.
Betula klokovii is a species of tree restricted to Ukraine. These trees grow on sandy hills in steppe grasses and dry chalkstone or in open woodlands. It is only found in two mountains: Strakhova and Maslyatyn, near Kremenets in the Ternopil region.
Podonephelium subaequilaterum is a tree species endemic to the sclerophyllous forests of New Caledonia. This species of trees suffers from forest reduction and fragmentation due to agriculture on the west coast of the country. The main threat to the species comes from habitat destruction due to the Javan rusa deer and uncontrolled forest fires. Its area of occupancy (AOO) is estimated to be 12 square kilometres (4.6 sq mi) and its extent of occurrence (EOO) is around 15 square kilometres (5.8 sq mi). The species is observed to be in a continuing decline of its quality of habitat, number of subpopulations, extent of occurrence, area of occupancy and the number of mature individuals.
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 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 (CR). In 2012, the IUCN Red List featured 3,079 animal and 2,655 plant species as endangered (EN) worldwide. The figures for 1998 were 1,102 and 1,197 respectively.