'Great speciators' explained: It's intrinsic

New molecular research shows that birds within the family Zosteropidae - named white eyes for the feathers that frame their eyes - form new species at a faster rate than any other known bird. Remarkably, unlike other rapid diversifications, which are generally confined in their geography, white eyes have managed to diversify across multiple continents and far-flung islands spanning much of the eastern hemisphere. The research was published this week in Proceedings of the National Academy of Sciences...

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