A Little Bit of Color Turns Barn Swallows into Macho Males

By darkening the breast feathers of male New Jersey barn swallows with a common marker, researchers from the Arizona State University showed that birds with naturally darker feathers attract more females than birds with lighter feather coloring. The experiment further proved that dark feathers can also boost the testosterone levels and may even help the birds lose weight. In a previous study carried out three years ago by the same team, it was proven that male birds that have been darkened were ... Read »

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