How are scientists able to say that a random species is extinct? Did they have to look everywhere?
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The Okapi was once considered extinct (and I believe was used on the logo of a charity/organisation for extinct animals? May be remembering that wrong) but was later rediscovered.
The most famous example though is the coelacanth. So species absolutely can be declared extinct and slip under the radar.
Also there’s a lot of reports of some extinct species, like the Thylacine, being sighted from time to time.
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