Human females are nearly unique among species in

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Human females are one of the few species that have a menstrual cycle. While most female mammals have an estrous cycle and exhibit signs of being in heat, human females do not have a specific time of fertility and instead have a menstrual cycle that prepares the uterus for possible pregnancy. The slight spotting during ovulation is not unique to human females and can occur in some other mammals as well. Humans also do not engage in sexual intercourse specifically during estrus, as there is no clear indication of when a woman is most fertile.

Human Females Are Nearly Unique Among Species in