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The researchers studied the birds over three breeding seasons, recording the numbers and types of interactions with unrelated adults of 24 banded nestlings. Then, (...) , during the 2004-5 season, another team of observers, unaware of the birds experiences as chicks, recorded the behavior of the same birds as adults interacting with unrelated nestlings. They found high correlations between the amount of aggressive behavior demonstrated by the adults and the amount of abuse they had endured as nestlings.
David J. Anderson, the senior author and a professor of biology at Wake Forest University, said that other studies had found increased levels of the stress hormone corticosterone in abused chicks, http://www.borsebbrits.com/ , which may influence aggressive behavior later in life.
Nazca boobies with their chick on Isla Española, Galápagos. Adults leave their chicks to find food.
"Its not just humans, and its not just a pathology associated with captivity," Dr. Anderson said. "Maybe the cycle of violence is generalizable, and we may have other research models to work with in ways we cant work with humans."
Although it has never been definitively proven, many social scientists believe that abused children are more likely to become abusers as adults. Now for the first time, (...) , there is evidence of the phenomenon in animals in the wild.
NEW IBERIA, La. - In a dome-shaped outdoor cage, a dozen chimpanzees are hooting. The hair on their shoulders sticks straight up. "That's piloerection, (...) ," a sign of emotional arousal, says Dr. Dana Hasselschwert, head of veterinary sciences at the New Iberia Research Center. She tells a visitor to keep his distance. The chimps tend to throw pebbles - or worse - when they get excited.
Tim Mueller for The New York Times
Biomedical research on chimps helped produce a vaccine for hepatitis B, and is aimed at one for hepatitis C, which infects 170 million people worldwide, but there has long been an outcry against the research as cruel and unnecessary. Now, because of a major push by advocacy organizations, a decision to stop such research in the United States could come within a year. As it is, the United States is one of only two countries that conduct invasive research on chimpanzees. The other is the central African nation of Gabon.
Chimps Days in Labs May Be Dwindling
Chimps' similarity to humans makes them valuable for research, and at the same time inspires intense sympathy. To research scientists, they may look like the best chance to cure terrible diseases. But to many other people, they look like relatives behind bars.
Correction Appended
Published: November 15, 2011
"This is a very different moment than ever before," said Wayne Pacelle, (...) , president and chief executive of the Humane Society of the United States. "Now is the time to get these chimps out of invasive research and out of the labs."
Marlon, a 10-year-old chimpanzee at the New Iberia Research Center in Louisiana.
By JAMES GORMAN
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