Sentences with phrase «female rhesus»

Influence of parenting style on the offspring's behaviour and CSF monoamine metabolite levels in crossfostered and noncrossfostered female rhesus macaques

A new study suggests that female rhesus monkeys engage in a kind of baby talk, casting doubt on the long - held belief that the behavior is exclusively human.

Although female rhesus monkeys don't baby talk to their own young, they make pantlike grunts and high - pitched, melodic nasal sounds called girneys when near other baby monkeys.

They watched 19 female rhesus monkeys both before and after their birth season.

Luis Barreiro at the University of Montreal, Canada, and colleagues sorted female rhesus monkeys who had never met into groups and observed as they formed a social pecking order.

In their study, the researchers had 60 human subjects view a series of digital photographs of female rhesus macaque monkeys, above, whose facial color changes to give social cues.

Using these images and 20 years of genetic parentage data, the researchers assessed whether the variation in red ornaments influenced fecundity — that is they produced more offspring — and is heritable in male and female rhesus macaques, two necessary conditions for the trait to be considered under sexual selection.

The collaborative international research also shows that skin coloration in male and female rhesus macaques is an inherited quality — the first example of heritability for a sexually - selected trait to be described in any mammal.

In a huge study of female rhesus macaques, a scientist from the University of Exeter found those with many close female relatives have better life expectancy.

The researchers used a large dataset spanning 21 years and including 910 adult female rhesus macaques in Puerto Rico.

Not exact matches

Previous studies have shown that rhesus macaque skin coloration is involved in mate selection - both males and females show interest in darker red faces displayed in the opposite sex.

A dominant rhesus with a full belly may let a subordinate take away his meal, says Irwin Bernstein, a University of Georgia psychologist, and a female bored by her alpha male may slip away for a fling with a hot young beta.

Falk suspects the size discrepancy can be linked to the philandering tendencies of our primate ancestors.Falk found that like humans, male rhesus monkeys had larger brains than females, while male and female gibbon apes were equally endowed.

There's the clutching reaction of the rhesus monkey, in which the female generally reaches back with one hand and grasps the male, sometimes turning and looking over her shoulder at the presumed moment of his climax — which, if it does indicate a female eruption as well, would leave people in the dust when it comes to simultaneous orgasms.

Alpha male status and availability of conceptive females are associated with high glucocorticoid concentrations in high - ranking male rhesus macaques (Macaca mulatta) during the mating season.