Human females may get of fended at dates who expect a little something extra after they buy a steak dinner, but for chimpanzees, the exchange may be a fair one, German researchers reported on Tuesday.
They found that female chimpanzees mate more frequently with males who often share meet with them.
“Our results strongly suggest that wild chimpanzees exchange meet for sex, and do so on a long-term basis,” Cristina Gomes of the Max Plank Institute for Evolutionary Anthropology in Leipzig, Germany said in a statement.
“Males who shared meat with females doubled their mating success, whereas females, who had difficulty obtaining meat on their own, increased their caloric intake without suffering the energetic costs and potential risk of injury related to hunting.”
Writing in the Public Library of Science journal PLOS ONE, Gomes and colleague Christophe Boesch said they watched chimps living in the Taj National Park in Ivory Coast.
“The meat for –sex hypothesis is a plausible explanation for male-female meat sharing in this species, as chimpanzees are highly promiscuous, they have a certain degree of female choice and hunters can usually control the sharing of their catch,” they wrote in their report.
Males were more likely to share meat with females whose bodies showed they were in a fertile period. “Our findings add to the ever-growing evidence suggesting that chimpanzees can think in the past and the future and that this influences their present behaviour,” Boesch said.
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