Conservation status
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The conservation status of a species is an indicator of the likelihood of that species continuing to survive. Many factors are taken into account when assessing the conservation status of a species: not simply the number remaining, but the overall increase or decrease in the population over time, breeding success rates, known threats, and so on.
The best-known worldwide conservation status listing and ranking system is the IUCN Red List, but other more specialised lists and systems exist, such as The Nature Conservancy's conservation status ranking system.