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In page Fertilisation:
"Male mammals internally fertilise females and ejaculate semen through the penis during copulation.[1][2] After ejaculation, many sperm move to the upper vagina (via contractions from the vagina) through the cervix and across the length of the uterus to meet the ovum. In cases where fertilisation occurs, the female usually ovulates during a period that extends from hours before copulation to a few days after; therefore, in most mammals, it is more common for ejaculation to precede ovulation than vice versa.[citation needed]
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