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Like whats the cut off?
It’s not a matter of numbers, more of trends. An endangered species (animal or plant) is one that is in immanent danger of extinction. The numbers could be huge but scattered over so wide an area that reproduction is unlikely. Conversely, I know of a plant that is not considered endangered, although the entire range is about the size of my living room. Some farmer with a plow could (theoretically) wipe it out in a day.
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There’s no cut-off, it varies from species to species. There are some animals, particularly large predators and species whose requirements are very specific, that simply never were that common. Some of these might have numbers in the hundreds or thousands on a good year, yet if the population is healthy and unstressed, it still wouldn’t be considered endangered. However, as soon as the population becomes stressed, it might plummet very quickly and catastrophically, and then it’s likely to be in much more serious trouble than a more common species, even if the common species is also suffering.
On the other hand, if a once common animal has become severely reduced in numbers due to overharvesting, habitat destruction, or similar, it might be considered endangered even though it still has ten times the numbers a rarer species has when it’s still considered a viable population. And if the populations of the more common species have become fragmented across a large area, so there’s very little genetic intermingling, it might be considered endangered with a hundred times the population of some little finch happily eating seeds on its 25 square miles of Caribbean island habitat.