Biology / Bio 3709 · Atom · ~20 seconds
How the IUCN Red List Classifies Extinction Risk
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The IUCN Red List orders extinction risk from least concern through critically endangered and extinct, intermediate categories included, using size, trend, and range.
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A species with a small, declining population and shrinking range classifies well up the ordering.
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Assuming every criterion must be met is the error — meeting one threshold alone suffices.