About Extinction, About Biodiversity, Value of the Natural World, Back From the Brink

Life on our planet has changed constantly over millions of years. The odd thing is: extinction is an essential part of the process.

Some new species evolve as others die out, but the turnover is usually small. We can make a fairly good guess at how often a species appears and disappears by studying the Fossil Record. It seems most species last for around 5 million years before they become extinct.

That spectacularly well-adapted predator, the Shark, may have been around for almost 100 million years. We have found fossilized Great White Shark teeth dated to 65 million years ago.

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