Sentences with phrase «sperm over the female»
At this moment, the male appears to release sperm over the female's back and then moves away.
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Females can store sperm for over a week before letting it fertilise an egg, so the foam could help keep sperm alive for a long period of time.
Researchers noticed, for example, that certain flies engage in courtship displays only after copulation has begun, perhaps as a way to get the female to favor a male's sperm over that of his competitors.
The male first sticks the sperm packet to a rock and the female walks over it so that it enters her genital opening.
As females store and use sperm to fertilize eggs over many years, sperm viability over time is important to both males and females.
Over the years, I have studied a variety of topics, including sperm competition, parental care, alternative reproductive behaviors, female mate choice and sexual conflict.
However, inseminated worms will often suction the sperm out of their female genital opening using their mouth when copulation is over.3 Some worms have also evolved countermeasures against such rejection: filamentous structures on the side of the sperm heads that anchor the genetic packages into the body cavity.4 (See illustration.)