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In an era of always-on information, it is surprising how little we know about key biological aspects of animal species worldwide. A paper published in the Proceedings of the National Academy of Sciences (PNAS) reveals that fundamental pieces of information, such as fertility and survival rates - the building blocks of how populations persist - are missing from global data for more than 98 percent of known species of mammals, birds, reptiles, and amphibians.

A group of meerkats in a zoo
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