How are scientists able to say that a random species is extinct? Did they have to look everywhere?
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Cannot look everywhere for obvious reasons. They have to do a statistical evaluation. At some point, the odds of the thing still existing when never seen despite being sought in all the places it likes to live, does lead to a pretty good likelihood that the poor lifeform is no longer in existence. And yet, there is an occasional find of something thought to be extinct for quite some time.
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