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Similar to the struggle between a parasite and its host, some species are locked in an evolutionary arms race between the sexes, with each gender battling to put its best interests forth. Smithsonian Museums, National Zoo Close. Science Age of Humans. They also scooped up newly emerged females, and put two of those females into a small outdoor enclosure with the males. This time, the researchers found, the males without a basal spine mated for a significantly shorter duration than the control group.

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However, the anesthetized females, compared to the natural ones, received smaller mating plugs even though the copulation period was longer.

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Mating Snakes Engage in a Literal Battle of the Sexes

At the Smithsonian Visit. Enter your email address. This may be because those numb females did not struggle, the researchers write, or it could be that the plugs adhere better to engaged vaginal muscles. Moreover, five of them did not manage to eject any sperm. They allowed the snakes to mate naturally while they monitored the duration of copulation, the behaviors involved and whether or not the males left a mating plug behind.

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