Scientists say it is first evidence of non-human primates living substantial post-reproductive life
Female chimpanzees in the wild undergo the menopause and live for a lengthy period afterwards, researchers have found, suggesting the phenomenon is more widespread than previously thought.
Quite why some female mammals have a long period of life once reproduction is off the table has long puzzled experts: not only was it previously thought to be confined to humans and five species of whale, but its purpose has also been highly debated.
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