How are scientists able to say that a random species is extinct? Did they have to look everywhere?
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Usually they get declared extinct after no one has seen one in a while.
For example the Bramble Cay mosaic-tailed rat was a small rodent only found on the small Bramble Cay island.
The island isn’t big and the last time anyone saw any of them was in 2009. since then people have gone looking for survivors several times over the years until in 2019 the Australian government and the ICUN in 2015 labeled them as ‘extinct’.
There is a chance that some of the small rodents might still live somewhere but unless on is found they are considered to be extinct.
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