When a Carolina Wren like this one sings, something remarkable happens. These birds can sing so loudly that you almost have to shout to be heard over their songs!

How can a bird like a Carolina Wren – at just 5½ inches long and weighing only as much as four nickels – produce so much sound? The answer lies in the songbird’s vocal anatomy. 

More info and transcript at BirdNote.org. 

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