Check us out at http://www.tutorvista.com//videos An endangered species is a population of organisms which is at risk of becoming extinct because it is either few in numbers, or threatened by changing environmental or predation parameters. Also it could mean that due to deforestation there may be a lack of food and/or water. The International Union for Conservation of Nature (IUCN) has calculated the percentage of endangered species as 40 percent of all organisms based on the sample of species that have been evaluated through 2006. (Note: the IUCN groups all threatened species for their summary purposes.) Many nations have laws offering protection to conservation reliant species: for example, forbidding hunting, restricting land development or creating preserves. Only a few of the many species at risk of extinction actually make it to the lists and obtain legal protection. Many more species become extinct, or potentially will become extinct, without gaining public notice. The more general term used by the IUCN for species at risk of extinction is threatened species, which also includes the less-at-risk category of vulnerable species together with endangered and critically endangered. IUCN categories include: The species has died, or is presumed beyond reasonable doubt to have died. Examples: Javan Tiger, Thylacine, Dodo, Passenger Pigeon, Tyrannosaurus, Caribbean Monk Seal, Dimetrodon, Aurochs •Extinct in the wild: captive individuals survive, but there is no free-living, natural population. Examples: Alagoas Curassow, Dromedary •Critically endangered: faces an extremely high risk of extinction in the immediate future. Examples: Mountain Gorilla, Arakan Forest Turtle, Darwin's Fox, Javan Rhino, Brazilian Merganser, Gharial, Vaquita •Endangered: faces a very high risk of extinction in the near future. Examples: Dhole, Blue Whale, Bonobo, Ethiopian wolf, Giant Panda, Snow Leopard, African Wild Dog, Tiger, Indian Rhinoceros, three species of Albatrosses, Crowned Solitary Eagle, Philippine Eagle, Markhor, Orangutan, Grevy's zebra, Tasmanian Devil •Vulnerable: faces a high risk of extinction in the medium-term. Examples: Cheetah, Gaur, Lion, Sloth Bear, Manatee, Polar Bear, African Golden Cat, Komodo dragon, Golden hamster •Conservation dependent: The following animals are not severely threatened, but must depend on conservation programs. Examples: Spotted Hyena, Blanford's fox, Leopard Shark, Black Caiman, Killer whale •Near threatened: may be considered threatened in the near future. Examples: Blue-billed Duck, Solitary Eagle, Small-clawed Otter, Maned Wolf, Tiger Shark, Okapi •Least concern: no immediate threat to the survival of the species. Examples: Nootka Cypress, Wood Pigeon, Harp Seal, White-tailed Mongoose, House Mouse, Wolverine
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