For barn swallows, feathers make the man, says study
Monday, June 2, 2008 - 12:07
in Astronomy & Space
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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