Aggression (Behavior)

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    No ‘Hippie Ape’: Bonobos Are Often Aggressive, Study Finds

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    Despite their peaceful reputation, bonobos act aggressively more often than their chimpanzee cousins, a new study found.In the early 1900s, primatologists noticed a group of apes in central Africa with a distinctly slender build; they called them “pygmy chimpanzees.” But as the years passed, it became clear that those animals, now known as bonobos, were profoundly different from chimpanzees.Chimpanzee societies are dominated by males that kill other males, raid the territory of neighboring troops and defend their own ground with border patrols. Male chimpanzees also attack females to coerce them into mating, and sometimes even kill infants. Among bonobos, in contrast, females are dominant. Males do not go on patrols, form alliances or kill other bonobos. And bonobos usually resolve their disputes with sex — lots of it.Bonobos became famous for showing that nature didn’t always have to be red in tooth and claw. “Bonobos are an icon for peace and love, the world’s ‘hippie chimps,’” Sally Coxe, a conservationist, said in 2006.But these sweeping claims were not based on much data. Because bonobos live in remote, swampy rainforests, it has been much more difficult to observe them in the wild than chimpanzees. More recent research has shown that bonobos live a more aggressive life than their reputation would suggest.In a study based on thousands of hours of observations in the wild published on Friday, for example, researchers found that male bonobos commit acts of aggression nearly three times as often as male chimpanzees do.“There is no ‘hippie ape,’” said Maud Mouginot, a biological anthropologist at Boston University who led the analysis.We are having trouble retrieving the article content.Please enable JavaScript in your browser settings.Thank you for your patience while we verify access. If you are in Reader mode please exit and log into your Times account, or subscribe for all of The Times.Thank you for your patience while we verify access.Already a subscriber? Log in.Want all of The Times? Subscribe. More

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      Traumatic Brain Injury Found in Maine Gunman Could Have Wide Ramifications

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      Exposure to blasts, even at low levels, may play a much greater role in veterans’ mental health struggles than has been known, with implications for treatment strategies and for criminal justice.Shredded connections deep in the brain. Battered and scarred blood vessels that are no longer able to support neurons. Clumps of dead cell debris marking a long pattern of injury.The results of the autopsy of Robert R. Card II, the Army Reservist who killed 18 people, then himself, in the deadliest shooting in Maine’s history, left little question that his brain was profoundly damaged. But the finding raises other questions that have broad implications for the military and for the nation’s millions of veterans.Mr. Card was a grenade range instructor who never deployed to combat. He is not known to have ever hit his head in a serious car crash, he never played football, and he does not appear to have had any other accidents that might account for the damage to his brain.His only exposure came from routine training blasts on the training range — at a level that is supposed to be safe.If those blasts were still strong enough to profoundly damage his brain, as it appears happened, then how many other troops are being exposed to the same risk? How many veterans may be struggling with similar injuries that have gone unseen or been misunderstood? How should those veterans be treated if they seek mental health care, or are accused of crimes?“The implications are just so large,” said Frank Larkin, a former Navy SEAL and sergeant-at-arms of the U.S. Senate, whose son, Ryan, also a Navy SEAL, died by suicide and was found to have extensive brain damage from blasts.We are having trouble retrieving the article content.Please enable JavaScript in your browser settings.Thank you for your patience while we verify access. If you are in Reader mode please exit and log into your Times account, or subscribe for all of The Times.Thank you for your patience while we verify access.Already a subscriber? Log in.Want all of The Times? Subscribe. More