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Designation of a rare species may be made by an official body such as a national government, state or province. However, the term is used more commonly without reference to a specific criteria. The IUCN does not normally make such designations but may use the term in its scientific discussions. Categories & Criteria (version 3.1) IUCN, 2001. The concept of rarity is established from having a very small number of organisms worldwide, usually a number less than 10,000; however, the concept is also influenced by having a very narrow 128:116-125 (2001) A species may be endangered or vulnerable, but not considered rare if, for example, it has a large, dispersed population but its numbers are declining rapidly or predicted to so. Rare species are generally considered threatened simply because the inability of Small Population Size s to recover from stochastic events, and the potential for a rapid decline in population. EXAMPLES OF RARE SPECIES
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