Species that are declining in numbers so fast they may soon become extinct are called?

There are many different measurements for species status used to list a species by different groups, and lists, but this is the general meaning of "endangered species" status listing in many groupings. Because the definition has, "soon become extinct" it could also refer to "critically endangered species" as well. This doesn't apply to all the different groups, or lists, and most have their own precise individual definitions, which they use to measure a species population. When using an endangered species report or list, it's best to read through their listing and profile information so you understand the verbiage they use and what it implies for the species. For more details, please see the sites listed below.