These questions are just a small example of what the dataset can help answer-which is why Weiss and team have released their work in full. This stability, hinted at in other studies, could help scientists test how different personalities affect reproductive success and other life outcomes in people. ( Read Jane Goodall's take on her own legacy.) Since the two Gombe datasets largely jibe, the team argues that chimpanzees’ personalities don't change much over time. Few of the previously “depressed” chimpanzees were now regarded as “agreeable.” Just the Beginning When Weiss and his colleagues compared the new surveys with the 1973 results, they found consistencies in the chimpanzees' personalities.įor instance, many of the apes rated “gregarious” in the 1970s were considered “extroverted” in the new ratings. “It was an amazing privilege that they took the time to help out with this.” ( What it's like to work with Jane Goodall in the field.) “It was pretty awe-inspiring-I knew about these field assistants, having read work by Jane Goodall before,” says Weiss. After eight weeks, Weiss and his colleagues had collected more than 11,000 survey responses from the assistants, some of whom had observed the park’s chimpanzees for 35 years. In October 2010, Weiss first traveled to northwestern Tanzania and met with 18 Gombe field assistants, asking them to rate the personalities of 128 chimpanzees. The 1973 survey was arguably ahead of its time scientific interest in animal personality only really took hold in the late 1990s and early 2000s.Īmid the flurry of new research, scientists studying chimpanzees in captivity had devised a new kind of behavioral questionnaire that inspired Weiss and colleagues to re-survey Gombe’s field assistants. “The carcass was consumed in the way that normal prey is consumed, slowly and with relish, each mouthful of meat chewed up with a few green leaves," Goodall noted in her 1990 book Through a Window. ( Read about the chimpanzee leader who was exiled, killed, and partially cannibalized.) In 1975, Passion went on a cannibalistic killing spree, kidnapping and eating at least three baby chimpanzees. The team chose not to include one outlier: a female named Passion, whom Gombe workers had cast as “a disturbed, isolated, aggressive individual,” Buirski and a colleague later wrote. The successful survey showed that male and female chimpanzees tend to have different personalities for instance, females tended to be more trusting and timid than males. Based on surveys of Gombe staff, the team profiled 24 Gombe chimpanzees’ personalities along 10 different behavioral traits, such as belligerence and playfulness. In 1973, researcher Peter Buirski visited Gombe with Goodall’s blessing to continue some of the personality research. Her dream to study our closest relatives began in 1960 in Gombe Park, Tanzania, and she continues her work to save them today. Jane Goodall has taught the world more about chimpanzees than anyone else in the world. Goodall’s field observations of Gombe’s chimpanzees, supported by the National Geographic Society, showed that chimpanzees not only eat meat but also use tools, make tools, and display unique personalities. His personality ratings for 128 chimpanzees-many of whom Goodall herself studied in the 1960s and 1970s- were published October 24 in the journal Scientific Data. You have to go out to the wild.” ( See the groundbreaking documentary JANE, the untold story of Jane Goodall’s life and work.) “Studying personalities in zoos has its advantages, but if you want to ask questions about something like personality is related to reproductive success… you can’t address these questions in captive samples. “It’s the most famous groups of chimpanzees in the world, and I thought this was a terrific opportunity,” says study leader Alexander Weiss, a psychologist at the University of Edinburgh. The new study provides fresh insight, suggesting that, like humans, chimpanzee personalities are stable over time-a discovery that could help scientists test ideas for how our own temperament evolved. Now, for the first time in decades, behavioral scientists have revisited some of Goodall's original observations of the animals' personalities. The wild chimpanzees at Tanzania’s Gombe Stream National Park are at the heart of Jane Goodall’s groundbreaking research. Watch Jane, an intimate portrait of Jane Goodall's chimpanzee research, on March 12 at 8 p.m.
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