In the world of birds, where fancy can be as fleeting as flight, the color of the bird apparently has a profound effect on more than just its image. A new study of barn swallows reveals it also affects the bird's physiology. A team of researchers, including one from Arizona State University, found in an experiment that involved artificially coloring the breast feathers of male barn swallows the testosterone levels of the manipulated birds soared in a short period of time. (source: asunews.asu.edu)
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