ScienceDaily Posted August 15, 2016 Share Posted August 15, 2016 If you are a male barn swallow in the United States or the Mediterranean with dark red breast feathers, you're apt to wow potential mates. But if you have long outer tail feathers in the United States, or short ones in the Mediterranean, the females may not be so impressed. Read the full article on ScienceDaily Link to comment Share on other sites More sharing options...
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