Unfortunately we don’t know about everything about all of the world’s species over this period, so it’s likely that some will have gone extinct without us even knowing they existed in the first place. The IUCN Red List has estimated the number of extinctions over the last five centuries. Species that have gone extinct, mainly due to human pressures. 1 Most species have gone extinct.īut when people ask the question of how many species have gone extinct, they’re usually talking about the number of extinctions in recent history. 99% of the four billion species that have evolved on Earth are now gone. Extinctions have been a natural part of the planet’s evolutionary history.
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