threatened species
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Encyclopedic overview
A threatened species is any species (including animals, plants and fungi) which is vulnerable to extinction in the near future. Species that are threatened are sometimes characterised by the population dynamics measure of critical depensation, a mathematical measure of biomass related to population growth rate. This quantitative metric is one method of evaluating the degree of endangerment without direct reference to human activity.
IUCN definition
Excerpted from Wikipedia’s “threatened species” article, available under the CC BY-SA 4.0 licence.