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It actually doesn't matter the length of time. When the last animal of that specific species is dead, the the animal is proven to be extinct.

Sometimes animals are thought to be extinct, then are re discovered, as the case of the ivory billed woodpecker in the U.S.

It usually takes many years after the last sightings of an animal before it is declared extinct. In some cases the last known animal of a species is in a zoo so when that animal dies the species will be declared extinct. This was the case with the passenger pigeon which was hunted to extinction in the early 20th century. The last passenger pigeon died in the Cincinnati Zoo in 1914.

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14y ago

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