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'''Menstruation''' or '''menses ''' occurs at the end of a [[placenta]]l [[mammal]]'s menstrual cycle. There are two types of menstruation:
* Overt menstruation, occuring in [[human]]s and [[great apes]], in which the lining of the [[uterus]] is shed and expelled from the body;
* Covert menstruation, occuring in all other placental mammals, in which the [[endometrium]] is reabsorbed.
