Discussion
How many species of major taxonomy groups are mentioned as Critically Endangered (CR) in the IUCN Red List version 2023-1 (updated on 11th December 2023) ?
Answer: D
The key gives 9760.
The IUCN Red List groups assessed species into categories, and Critically Endangered (CR) is the highest category of threat for a species still living in the wild: it means the species faces an extremely high risk of extinction. A species qualifies under any one of five sets of criteria, for example a population reduction of at least 80 to 90% over ten years or three generations, fewer than 250 mature individuals with a continuing decline, fewer than 50 mature individuals, or a probability of extinction in the wild of at least 50% within ten years or three generations.
The count of CR species changes with every release of the Red List, which is why the question names version 2023-1 and its date of 11 December 2023. I could not retrieve IUCN's summary statistics table for that release, so I could not check 9760 against it, and no source I could reach contradicts it. The other options, 7762, 8722 and 9251, differ from it only in the figure, so the answer rests on the key and on recall of the table.
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