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Socialization processes, parents, or peers encouraging play with gender specific toys are thought to be the primary force shaping sex differences in toy preference. A contrast in view is that toy preferences reflect biologically determined preferences for specific activities facilitated by specific toys. Sex differences in juvenile activities, such as rough and tumble play, peer preferences, and infant interest, share similarities in humans and monkeys. Thus if activity preferences shape toy preferences, male and female monkeys may show toy preferences similar to those seen in boys and girls. We compared the interactions of 34 rhesus monkeys, living within a monkey troop, with human wheeled toys and plush toys.
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According to the paper, "Payment for Sex in a Macaque Mating Market," published in the December issue of Animal Behavior, males in a group of about 50 long-tailed macaques in Kalimantan Tengah, Indonesia, traded grooming services for sex with females; researchers, who studied the monkeys for some 20 months, found that males offered their payment up-front, as a kind of pre-sex ritual. It worked. After the females were groomed by male partners, female sexual activity more than doubled, from an average of 1. The study also showed that the number of minutes that males spent grooming hinged on the number of females available at the time: The better a male's odds of getting lucky, the less nit-picking time the females received. Though primates have been observed trading grooming for food sharing or infant care, this is the first time this kind of exchange has been observed between male and female primates in a sexual context, says lead researcher Michael Gumert of Singapore's Nanyang Technological University, demonstrating that the amount of time a male macaque "will invest in [its] partner" depends largely on how many options it has around. We, more evolved primates, may be tempted to take a cynical view of these findings, but the study's author suggests a more favorable interpretation: The macaques' exchange of services simply illustrates a nifty system of cooperation that allows for successful mating.
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HOW the peacock got his tail is one of evolutionary biology's best-known fables. It was first told by none other than the master of evolutionary theory himself: Charles Darwin. It is, Darwin said, all down to the fickle, female peahen. Because she prefers to mate with males with the flashiest tails, large-tailed males have more offspring.
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The randy macaque monkey was caught on camera hoisting himself up on a deer's back and furiously humping. Scientists believe that animals from different species could start having sex with each other after video footage emerged of a monkey and a deer. The footage shows the male macaque sexually interacting with a female sika deer in Japan by researchers earlier this year.
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