Guest hahathhat Posted June 17, 2009 Share Posted June 17, 2009 They may wear too much pink to fit in among macho fliers. But when male Anna’s hummingbirds swoop out of the sky, they pull more g’s than any known vertebrate stunt flier outside a cockpit, says Chris Clark of the University of California, Berkeley. During breeding season, the male hummingbirds soar some 30 meters and then dive, whizzing by a female so fast that their tail feathers chirp in the wind (SN: 8/25/07, p. 125). As the birds pull out of their plunge to avoid crashing, they experience forces more than nine times the force of gravity, Clark reports online June 9 in a biomechanical analysis in Proceedings of the Royal Society B. Anna’s (Calypte anna) have become one of the most common hummingbirds in backyards and parks along the West Coast. The males of the species are marked by dramatic pink plumage on their heads. The stunt flier’s great swoop forms one of the centerpieces of his courtship display to win female attention. The bird orients his display dive in relation to the sun so that his female audience will get the brightest view. “They look like a little magenta fireball dropping out of the sky,” Clark says. Clark “has found amazing things about this display,” says Doug Altshuler of University of California, Riverside, who also studies hummingbirds. The new paper shows “to what extraordinary lengths these birds are willing to go to impress potential mates” and could open new opportunities for studying sexual selection. Clark took advantage of the males’ predictable dive orientation, setting out a caged female, or even a stuffed female on a stick, to inspire birds to dive right in front of his video cameras. Males flew up and plunged over the female typically 10 or 15 times in a row, but one enthusiastic stunt flier completed 75 consecutive dives with a break of only a few minutes. Analyzing the recordings revealed that birds at first flapped their wings as they dove. For a short period at their peak speed, the birds folded their wings and drilled down through the air at speeds up to 27.3 meters per second (61 miles per hour). Adjust for body length, and the world just got a new fastest bird, Clark says. The hummingbirds’ speed reached 385 body lengths per second, easily beating the peregrine falcon’s recorded dives at 200 body lengths per second. (Though the falcon was diving at 70 meters per second.) A fighter jet with its afterburners on reaches 150 body lengths per second, and a space shuttle screaming down through the atmosphere hits 207 body lengths per second. That period of tucked wings allowed Clark to calculate how well the birds’ form coped with drag. “Birds may be a little bit more streamlined than expected,” Clark says. Then diving males stretch out their wings to pull out of their dive before crashing. “It’s like a gymnast doing an iron cross,” Clark says. If birds didn't have great strength for this maneuver, "their wings would just break off," Clark says. When the birds experience the maximum g-forces in their dives, Clark notes, the birds enter the range where human pilots, more vulnerable due to larger bodies and circulatory systems, have to be careful about the risk of temporary blackouts. Such prowess impressed Clark, but when he saw wild female birds watching the show … well. “Sometimes they looked bored or flew away,” he says. Males typically just kept on diving. http://www.usnews.com/articles/science/200...gun-stunts.html Link to comment Share on other sites More sharing options...
Guest ward Posted June 17, 2009 Share Posted June 17, 2009 so... wow, a guy with the same name as the 'almighty' chris clark, did something, completely unrelated.. FUCK YOU HAHAATHTHAHTHAT Link to comment Share on other sites More sharing options...
Guest hahathhat Posted June 17, 2009 Share Posted June 17, 2009 They may wear too much pink to fit in among macho fliers. “They look like a little magenta fireball dropping out of the sky,” Clark says. Link to comment Share on other sites More sharing options...
beariksson Posted June 17, 2009 Share Posted June 17, 2009 =P and this is from when he recorded Absence Link to comment Share on other sites More sharing options...
Solo Strike Posted June 17, 2009 Share Posted June 17, 2009 Magenta Fireball, coming soon on Clark's 2010 LP Link to comment Share on other sites More sharing options...
Guest Rabid Posted June 17, 2009 Share Posted June 17, 2009 Shouldn't this be in the Clark subforum? Link to comment Share on other sites More sharing options...
Guest tv_party Posted June 17, 2009 Share Posted June 17, 2009 fastest bird subforum Link to comment Share on other sites More sharing options...
MAXIMUS MISCHIEF Posted June 17, 2009 Share Posted June 17, 2009 that was interesting Link to comment Share on other sites More sharing options...
Guest Tony Danza Posted June 17, 2009 Share Posted June 17, 2009 Pretty. Link to comment Share on other sites More sharing options...
Dr Clitterhaus Posted June 17, 2009 Share Posted June 17, 2009 Danza, i still wanna see that Jap ladies poop. Link to comment Share on other sites More sharing options...
chaosmachine Posted June 17, 2009 Share Posted June 17, 2009 slow this bird down. Link to comment Share on other sites More sharing options...
Guest hahathhat Posted June 17, 2009 Share Posted June 17, 2009 Pretty. Link to comment Share on other sites More sharing options...
Guest Tony Danza Posted June 18, 2009 Share Posted June 18, 2009 Danza, i still wanna see that Jap ladies poop. We all do, Dr. Clitterhaus. We all do. Link to comment Share on other sites More sharing options...
Squee Posted June 18, 2009 Share Posted June 18, 2009 HAAA! Link to comment Share on other sites More sharing options...
Guest hahathhat Posted June 18, 2009 Share Posted June 18, 2009 falling birdman Link to comment Share on other sites More sharing options...
Guest abusivegeorge Posted June 18, 2009 Share Posted June 18, 2009 Whacky inflatable flailing arm tube man Link to comment Share on other sites More sharing options...
Guest hahathhat Posted June 18, 2009 Share Posted June 18, 2009 Link to comment Share on other sites More sharing options...
Guest thanksomuch Posted June 18, 2009 Share Posted June 18, 2009 soooo cute >.< Link to comment Share on other sites More sharing options...
Guest hahathhat Posted June 18, 2009 Share Posted June 18, 2009 Link to comment Share on other sites More sharing options...
Guest hahathhat Posted June 18, 2009 Share Posted June 18, 2009 Link to comment Share on other sites More sharing options...
Siegecow Posted June 18, 2009 Share Posted June 18, 2009 lol Link to comment Share on other sites More sharing options...
Squee Posted June 18, 2009 Share Posted June 18, 2009 I've never been into Chris Clark, so correct me if I'm wrong, but didn't he make an album about being in a wheelchair or something? If 'yes', then that's a fucking lol. Link to comment Share on other sites More sharing options...
Guest blicero Posted June 18, 2009 Share Posted June 18, 2009 this should be grounds for banning fucking white noise Link to comment Share on other sites More sharing options...
Guest Coalbucket PI Posted June 18, 2009 Share Posted June 18, 2009 you make poor threads hathat Link to comment Share on other sites More sharing options...
jules Posted June 18, 2009 Share Posted June 18, 2009 word on the street was that after he brought the bird back to the lab, there were a lot of people who really really loved it, but even more people wondered why the bird was so compressed. Link to comment Share on other sites More sharing options...
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