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June 26, 2007--Call him the Mona Lisa of the bird kingdom. The rare recurve-billed bushbird, recently rediscovered by scientists in Colombia after a 40-year absence, sports a curving beak that gives the illusion of an enigmatic smile. This photograph, taken by a conservationist with the Colombia-based nonprofit Fundación ProAves, is the first ever taken of a live bushbird. The elusive species had not been spotted between 1965 and 2004, due to its limited range and remote habitats. It was seen recently in Venezuela and in a region of northeastern Colombia, where it was photographed. Researchers found the bird in a 250-acre (101-hectare) reserve next to the Torcoroma Holy Sanctuary near the Colombian town of Ocaña, where in 1709 locals claimed they saw the image of the Virgin Mary in a tree root. The forests of the sanctuary have been protected by Catholic Church authorities in the centuries since. The researchers also found and photographed the extremely rare Perija parakeet, of which only 30 to 50 individuals likely survive. Deforestation and wildfires for agriculture and grazing have denuded much of the birds' habitat, conservationists say. "[A]s more and more remote areas are being settled, the bushbird reminds us how important it is to conserve as much natural habitat as we can," said Paul Salaman of the American Bird Conservancy. "Who knows what wonderful biodiversity is being destroyed before it has had a chance to be discovered?" |
By LINDSEY TANNER,
AP Medical Writer
CHICAGO - Here's some good and bad news for chocoholics: Dark chocolate seems to lower blood pressure, but it requires an amount less than two Hershey's Kisses to do it, a small study suggests. The new research from Germany adds to mounting evidence linking dark chocolate with health benefits, but it's the first to suggest that just a tiny amount may suffice.
Volunteers for the study ate just over 6 grams of dark chocolate daily for almost five months -- one square from a German chocolate bar called Ritter Sport, equal to about 1 1/2 Hershey's Kisses. People who ate that amount ended up with lower blood pressure readings than those who ate white chocolate.
University of Cologne researcher Dr. Dirk Taubert, the study's lead author, said the blood pressure reductions with dark chocolate were small but still substantial enough to potentially reduce cardiovascular disease risks, although study volunteers weren't followed long enough to measure that effect.
The research involved just 44 people aged 56 through 73, but the results echo other small studies of cocoa-containing foods. Cocoa contains flavanols, plant-based compounds that also are credited with giving red wine its heart-healthy benefits.
One problem is chocolate bars containing cocoa tend to have lots of calories, so Taubert and his colleagues tested small amounts containing just 30 calories each.
The study appears in Wednesday's Journal of the American Medical Association. It was funded by University Hospital in Cologne.
The results are interesting but need to be duplicated in larger, more ethnically diverse populations, said Dr. Laura Svetkey, director of Duke University's Hypertension Center.
She stressed that the study results should not be viewed as license to gorge on chocolate.
"I would be as happy as the next person if I got to eat more chocolate," she said, but cautioned that weight gain from eating large amounts of dark chocolate would counteract any benefits on blood pressure.
Study participants were otherwise healthy and mostly normal-weight German adults with mild high blood pressure or pre-hypertension, which includes readings between 120 over 80 and 139 over 89.
Average blood pressure at the start was about 147 over 86.
Every day for 18 weeks, the volunteers were instructed to eat one-square portions of a 16-square Ritter Sport bar, or a similar portion of white chocolate. White chocolate doesn't contain cocoa.
Systolic blood pressure, the top number, fell an average of nearly three points and diastolic dropped almost two points in the dark chocolate group, compared with no change in blood pressure readings in the white chocolate group.
Tests suggested that steady exposure to dark chocolate prompted chemical changes that helped dilate blood vessels and regulate blood pressure, the researchers said.
Participants were told not to eat other cocoa-containing products and to continue regular eating habits and activity levels. They also kept food diaries so researchers could see if other foods might have influenced the results.
But, said Taubert, "It is very unlikely that other factors may explain the blood pressure reduction."
Dr. Lawrence Appel of Johns Hopkins School of Medicine said the most proven non-drug methods for lowering blood pressure are losing weight and eating less salt. Eating dark chocolate might help if combined with those two, he said.
For most people, "the lower your blood pressure, the better you are. So if you can get it lower from different strategies that's good for the long term," Appel said,
Eight differences are submerged amid the nautical gear in these two photos. Last one to find them is all wet.