For barn swallows, feathers make the man, says study

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University of Colorado at Boulder Assistant Professor Rebecca Safran of the ecology and evolutionary biology department retrieves a North American barn swallow from a mist net for marking and release. Credit: Kevin Stearns
University of Colorado at Boulder Assistant Professor Rebecca Safran of the ecology and evolutionary biology department retrieves a North American barn swallow from a mist net for marking and release. Credit: Kevin Stearns

A new study led by the University of Colorado at Boulder has shown the testosterone of male North American barn swallows skyrocketed early in the breeding season when their breast colors were artificially enhanced by researchers, indicating the clothes -- or in this case, the feathers -- make the man.


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