Mammals that live in groups may live longer, longevity research suggests

For mammals, one secret to a long life may be spending it living with friends and family.

An analysis of the life spans and social lives of nearly 1,000 mammal species shows that species that live in groups, such as horses and chimpanzees, tend to live longer than solitary beasts, like weasels and hedgehogs. The finding suggests that life span and social traits are evolutionarily entwined in mammals, researchers report January 31 in Nature Communications.

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The maximum life span of mammals ranges widely. The shortest-lived

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