These are the special feathers that allow the
club-winged manakin (
Machaeropterus
deliciosus) to play its wing like a violin! Happily,
this little bird, which resides in the cloud forest of the Andes in South America, is not threatened with extinction and is free to play its song (
listen here). The male does that by rubbing a specialized feather with a stiff tip bent at a
45
° angle (
the 4th feather in the image above) against another feather that has 7 separate
ridges (
3rd feather above) to produce a mating call. As a graduate student at Yale University in 1997,
Kim Bostwick theorized that the birds knock their wings above their backs to create sound, but it is only recently - with a portable
high-speed camera that she and her colleagues were able to confirm that club-winged manakins knock their wings together
more than 100 times per
second in order to sing as a courtship display. Now curator of birds and mammals at the
Cornell University Museum of Vertebrates, Bostwick describes:
"I recorded males making this sound in the Ecuadorian Andes using a digital high-speed video camera. By examining the video at slower speeds, I could see that the males were knocking a pair of modified wing feathers together over their back at a very high rate - more than 100 cycles per second - twice as fast as an average hummingbird flaps its wings."
Their probability of procreating is directly proportional to the accomplishment of this "
on-board violin" (
more here, including a video).
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