http://www.newscientist.com/article/mg20527445.000-intense-males-have-the-best-sperm.html?DCMP=OTC-rss&nsref=love-sex ~Tiffany Miller Ronald Orenstein wrote:
As I understand it no animal can directly synthesize carotenoids but must get them from their diet. There is a great deal of ornithological literature on this subject, especially from the lab of Geoffrey Hill, particularly based on the hypothesis that carotenoid levels are an "honest signal" of fitness because their presence is an indicator of overall health and ability to find sufficient amounts of food.
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