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Bats with " disproportionately bombastic " penises that do n’t fit inside the females ' vaginas are the only mammalian get it on to have sexuality without insight , scientists have key out .
mammalian usually copulate via knifelike sex , but European brown bat bats ( genus Eptesicus serotinus ) have evolve a different strategy . Instead of inserting their penis into the female ’s vagina , Male use their oversize crotch to bear on apart their spouse ’s tooshie sheath , before pressing up against her vulva for up to 12 hours , accord to a bailiwick published Monday ( Nov. 20 ) in the journalCurrent Biology .
Serotine bats (Eptesicus serotinus) are the only mammals shown to engage in non-penetrative sex, also known as contact mating.
" We had observed that these bats have disproportionately long penises , and we were always enquire ' how does that process ? ' , " lead authorNicolas Fasel , a postdoctoral researcher and evolutionary biologist at the University of Lausanne in Switzerland , said in a financial statement shared with Live Science .
It turn out , it does n’t work on — at least not like in other mammals . Their penises are seven times longer and across-the-board than the females ' vaginal openings when tumid , making post - erection keen gender impossible .
" We thought maybe it ’s like in the frankfurter where the penis engorges after penetration so that they are locked together , " Fasel said . " Or alternatively maybe they just could n’t put it at heart , but that type of copulation has n’t been report in mammals until now . "
The longest mating event recorded in serotine bats lasted for almost 13 hours.
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Fasel and his fellow worker analyse footage from television camera they had placed on a grid that the chiropteran could go up , and where the animals ' crotch were seeable during coition . They recorded a amount of 97 mating events in the dome of a Dutch church building and in a bat reclamation center inUkraine . None of the sexuality school term appeared to involve penetration .
rather , the footage depict males grasping female by the nape and moving their renal pelvis until their erect penis was pushed firmly against their partner ’s vulva . The Male then stay on completely still in this bosom for an average of 53 minutes , with the long interaction live on almost 13 hours .
The researchers noted the penis were enlarged before coming into contact with the vulva , excluding the possibility of even pre - erection penetration , which is known to occur in dogs .
The squad also value and described the erect phallus of springy serotine at-bat . These beast grow erections under anesthesia , according to the statement , enabling researcher to document a " spunk - shaped " swell at the tip of the member .
" The concluding swelling was adorned with a few short hairsbreadth and composed of two large erectile tissue , " the researchers wrote in the study . " We postulate that the whisker present on the terminal swelling serve as a sensor to assist in finding the vulva . "
European brown bat bat may have evolved an oversized penis so they could promote away a tissue layer that covers the female ' genitals . " Bats apply their tail membrane for fly and to capture the dirt ball [ they use up ] , and female bats also use them to cover their down in the mouth part and protect themselves from male , " Fasel say . " But the males can use these braggy penises to sweep over the tail membrane and reach the vulva . "
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The fur on female bat ' abdomens appeared sozzled after mating , indicating the presence of semen , but sample are needed to confirm that males blunder out during the long embracement , concord to the work .
This is the first document evidence of non - penetrative sexual activity , also known as " contact mating , " in mammals . This behavior has been draw in birds , however , and regard males and female press together openings called cloacae to execute " cloacal kisses , " resulting in a transfer of spermatozoon .
To better identify the mating behavior of serotine bats , Fasel and his colleagues " are trying to formulate a squash racket erotica box , which will be like an fish tank with cameras everywhere , " he said .
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