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Definitions (41)

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Learn More


Continue to The IUCN Red List
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authority


The taxonomic authority is the name of the person or people who published the original description for a particular scientific name, followed by the year of publication. If the name is in parentheses, this indicates that the genus name now used is different from the one used in the original description.
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biomes


Whether the species occurs in terrestrial, marine and/or freshwater habitats.
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common name


The common name of a species is the vernacular name used to refer to a species. Some species have several common names, often in different languages.
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CR


IUCN Red List Categories, Critically Endangered: A taxon is Critically Endangered when the best available evidence (severe population decline, very small population, very small geographic area occupied, or if the calculated probability of extinction during the next 10 years of >50%) indicates that it is facing an extremely high risk of extinctio [..]
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dd


IUCN Red List Categories, Data Deficient: A taxon is Data Deficient when there is inadequate information to make a direct, or indirect, assessment of its risk of extinction based on its distribution and/or population status. A taxon in this category may be well studied, and its biology well known, but appropriate data on abundance and/or distributi [..]
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en


IUCN Red List Categories, Endangered: A taxon is Endangered when the best available evidence (large population decline, small population, small geographic area occupied, or if the calculated probability of extinction during the next 20 years is >20%) indicates that it is considered to be facing a very high risk of extinction in the wild. See 200 [..]
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Ew


IUCN Red List Categories, Extinct in the Wild: A taxon is Extinct in the Wild when it is known only to survive in cultivation, in captivity or as a naturalized population (or populations) well outside the past range. A taxon is presumed Extinct in the Wild when exhaustive surveys in known and/or expected habitat, at appropriate times (diurnal, seas [..]
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ex


IUCN Red List Categories, Extinct: A taxon is Extinct when there is no reasonable doubt that the last individual has died. A taxon is presumed Extinct when exhaustive surveys in known and/or expected habitat, at appropriate times, throughout its historic range have failed to record an individual. Surveys should be over a time frame appropriate to t [..]
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Family


A Family is a level in the taxonomic hierarchy below Order, but above Genus.
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