An endangered species is a population of organisms which is facing a high risk of becoming extinct because it is either few in numbers, or threatened by changing environmental or predation parameters.
Their reproductive rates are lower than their mortality rates over long periods of time, so their numbers are diminishing. The reasons for this are varied, but lately, very often involves a loss of habitat as people encroach on their living areas.
The International Union for Conservation of Nature (IUCN) has always calculated the percentage of endangered species.
When a species is listed as endangered or threatened, it is not a death sentence. Many animals, like the bald eagle and the American alligator, were on the brink of extinction and are now recovering. Many species, however, will not recover, and could be lost forever.
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 like Pandas. Many more species become extinct, or potentially will become extinct, without gaining public notice.
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