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Author: admin, 24.02.2016. Category: Buzzing In Ears

This is an unofficial Tumblr dedicated to the great organization that is National Geographic. To see a manakin in action is to encounter a spectacular song and dance act in the middle of a tropical forest. Just a handful of ornithologists study the club-winged manakin, which lives in Colombia and Ecuador.
Scientists knew the wings were the source of the sound but didn’t know exactly how the process worked. Scientists are only beginning to learn how this complex, strange, and highly entertaining behavior evolved. To crack the conundrum, Bostwick recorded the bird’s movements on a video camera operating at a thousand frames per second, more than 30 times as fast as a standard camcorder.


In a paper that will be published later this year, Bostwick and her colleagues describe how they conducted micro-CT scans of manakin wings and discovered that the wing bones are solid. And in the flush of courtship, males execute maneuvers with names like the dart, the about-face, the upright, and the backward slide (which looks exactly like a Michael Jackson moonwalk). Viewing the video a few frames at a time led to a eureka moment: The bird was knocking its wings together 107 times a second. Examining the bird’s secondary feathers in the lab, Bostwick saw on each wing a specialized feather with seven separate ridges. The manakin’s bulky bones, Bostwick says, likely have evolved in order to support the knocking action of the large feathers. It is the only species that uses its feathers to generate a tick, tick, ting in the hope of making a female swoon.


But how, she wants to know, does this three-and-a-half-inch bird haul around the extra weight when it flies? The result is a violin-like tone, somewhere between an F sharp and a G, more than two octaves above middle C. And how does it manage “the incredible energy cost and physics involved in using that wing”? The world has nearly 10,000 species of avifauna, but no other creates sound this way—by scraping body parts together (although crickets do something similar).



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