Normal, but not this fast
Is Extinction Normal?
Almost every kind of animal that has ever lived is already extinct. What matters is not that it happens but how quickly.
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Step 1 of 5
Extinction means the last one has died.
Not rare, not hiding — gone, with no way back. A species can be brought back from a handful of animals, but never from none.
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Step 2 of 5
It has been happening steadily for as long as there has been life.
Species appear, last a few million years on average, and end. The fossil record is mostly a record of animals that are no longer here.
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Step 3 of 5
Five times, that steady trickle became a flood.
A mass extinction wipes out most species in a geological blink. The famous one ended the dinosaurs; an earlier one was far worse.
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Step 4 of 5
So the number that matters is the rate.
Today species are disappearing far faster than the fossil background rate — fast enough that biologists argue about whether a sixth flood has begun.
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Step 5 of 5
What makes it final is that a species is a recipe, not a thing.
A species is millions of years of accumulated instructions. Burn the only copy and no amount of money or care writes it again.
Extinction is not always a disaster for life as a whole — the end of the dinosaurs is exactly what left room for mammals.
The short version
Extinction is the ordinary end of every species, and nearly all have met it — so the alarming measurement today is the rate, not the fact.
Try it yourself
Name five animals that no longer exist. Every one you can name is from a very long list you cannot.