Blue Cap Cordons are tap dancers

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Shane Gowland
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Article posted today by IFLScience:

These Birds Tap Dance So Fast It's Invisible To The Naked Eye
After analyzing footage from 16 of the songbirds, the researchers discovered that both males and females rapidly tap their feet during courtship displays, step-dancing so quickly that it was invisible to the scientists’ eyes. For each bobbing motion, the bird would hop and stamp its feet repeatedly, which presumably produces vibrations responsible for the rhythmic sounds. They also found that if the birds were on the same perch, they would ramp up the dance and go full steam.
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Craig52
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It's marvelous what these researches get up to,they have got so much time on their hands to do these types of things. Gouldians do the same thing but much more slowly they are such lazy birds but are magnificent to look at and watch doing it :D Craig
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Finchy
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Isn't that wonderful?!! I just came across the video yesterday and couldn't believe it. Those legs appear to be working faster than a Hummingbird's wings, because at normal speed it's not detectable by eye at all.

So glad for researchers with time on their hands :).
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