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An endangered species is a population of an organism who is at risk of becoming extinct because it is both few in numbers, or threatened by changed environment or predation parameters. An endangered species is usually a taxonomic species, though may be another evolutionary significant unit. The World Conservation Union was calculated the percentage of endangered species as 40 percent of all organisms based at the sample of species that have been evaluating through 2006. Many nations have laws offering protection to this species: for example, forbidding hunting, restricting land development or creating preserves. Only a little of the many species at risk of extinct actually make it to the lists and obtain legal protection. Much more species become extinct, or potentially will become extinct, without gaining public notice.