what are the criteria for scientist to consider a species extinct? maybe they just didnt search enough, like given the vastness of earth there r probably areas still unexplored?
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They don’t. They assume it is, based on calculation on how often we should be seeing them if they were not extinct. Not sure of the exact threshold, but very often it is more of a “99.99% chance this is extinct” than “yep, that was the last one”. That’s why sometimes we actually can find animals that were previously thought extinct.
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