at least 2010. The term menstruator is used by some activists and scholars in order to "express solidarity with women who do not menstruate, transgender men who do, and intersexual and genderqueer individuals". However, use of the term "menstruators" has also been criticized by some feminists who consider sex differences important and the term woman to be necessary to resist patriarchy. The term "people who menstruate" is also used. Other mammals Most female mammals have an estrous cycle, but not all have a menstrual cycle that results in menstruation. Menstruation in mammals occurs in some close evolutionary relatives such as chimpanzees. See also Niddah (Jewish laws of menstruation) References Book sources External links Menstrual cycle Wikipedia medicine articles ready to translate Midwifery