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How Many Animal Species Are There on Earth?

A Compelling Question

We don't even know how many types of animals there are in the world, let alone how many there are. Donkeys have a total population of roughly 40 million, and mules have a significant population as well. And while we may find out how many animals are known to be in the world, we don't actually know how many there are.

List of Organisms by Population

October 12, 2022 – Monitored populations of vertebrates mammals.