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The new research shows that in males with more carotenoid, and thus more color, the sperm is better able to withstand a free radical onslaught—and females seem to know it.
The findings also give some insight into why female great tits cheat, Helfenstein added.
Because "females cannot always get the [colorful] males they want," he said, the females will often settle for a less flashy mate.
But the females will still sneak off for a rendezvous with a better-looking male—and a dose of better sperm.
Because "females cannot always get the [colorful] males they want," he said, the females will often settle for a less flashy mate.
But the females will still sneak off for a rendezvous with a better-looking male—and a dose of better sperm.