Estrous cycle  

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The estrous cycle (also oestrous cycle; derived from Latin oestrus and originally from Greek οἶστρος) comprises the recurring physiologic changes that are induced by reproductive hormones in most mammalian placental females. Humans undergo a menstrual cycle instead. Estrous cycles start after puberty in sexually mature females and are interrupted by anestrous phases or pregnancies. Typically estrous cycles continue until death. Some animals may display bloody vaginal discharge, often mistaken for menstruation, also called a "period".

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Unless indicated otherwise, the text in this article is either based on Wikipedia article "Estrous cycle" or another language Wikipedia page thereof used under the terms of the GNU Free Documentation License; or on research by Jahsonic and friends. See Art and Popular Culture's copyright notice.

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