Oct. 4, 2012, 3 a.m.

Baboons, like people, really do get by with a little help from their friends. Humans with strong social ties live longer, healthier lives, whereas hostility and ''loner'' tendencies can set the stage for disease and early death.

In animals, too, strong social networks contribute to longer lives and healthier offspring - and now it seems that personality may be just as big a factor in other primates' longevity status. A study has found that female baboons that had the most stable relationships with other females weren't always the highest up in the hierarchy or those with close family around - but they were the nicest.

Scientists are increasingly seeing personality as a key factor in an animal's ability to survive, adapt and thrive in its environment. But this topic isn't an easy one to study scientifically, says primatologist Dorothy Cheney, of the University of Pennsylvania.

''Research in mammals, birds, fish and insects shows individual patterns of behaviour that can't be easily explained. But the many studies of personality are based on human traits like conscientiousness, agreeableness, or neuroticism. It isn't clear how to apply those traits to animals,'' she says.

Along with a group of scientists, including co-authors Robert Seyfarth, also at the University of Pennsylvania, and primatologist Joan Silk of Arizona State University, Professor Cheney has studied wild baboons at the Moremi Game Reserve in Botswana for almost 20 years.

Besides providing detailed observations of behaviour in several generations of baboons, the research has yielded a wealth of biological and genetic data.

In previously published research, Professor Cheney and co-workers showed that females lived longer, had lower stress hormone levels and had more surviving offspring when they had close, long-lasting relationships with other females (characterised chiefly by spending time together and grooming).

Although dominance rank was significant for male baboons - alpha male baboons may live longer than lower-ranking males - this wasn't true for the females. Nor was an abundance of family the key to longevity. Not all of the longer-lived, less-stressed females had large families.

To find out more about how female baboons forge bonds, Professor Cheney and co-authors focused on detailed records of observations of 45 female baboons from 2001 to 2007. As a personality gauge, the researchers used specific behaviours, including how often the females were alone, how often they touched other females, how often they behaved aggressively, how often they were approached by others and how often they grunted when approaching other females of various ranks. Among female baboons, grunting is a sign of good will, Professor Cheney says. Using these criteria, the researchers characterised the baboons as ''nice'', ''aloof'' or ''loner''. The team also tested the baboons for levels of stress hormones known as glucocorticoids.

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For longevity, it's the survival of the nicest Save