Does all female animals have menstrual cycles?

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1008896

2026-02-28 00:15

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No. Only humans and closely related species such as chimpanzees have a period or menstrual cycle. Other mammals that have a placenta have a similar oestrous cycle, where the lining of the uterus is built up in case of pregnancy over a specific time cycle, but they don't shed the lining of the uterus as blood in the way humans do, they simply reabsorb the unused uterus.

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