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  • The Victoria cichlids fall in the special category of adaptive radiation called species flocks: they comprise relatively numerous species of immediate common ancestry and are limited to a single well-isolated area such as a lake, river basin, island, or mountain range. The chief theoretical puzzle created by species flocks is the process by which they grow. How can populations split repeatedly into species within a closed habitat that has no geographical barriers?
    —Edward O. Wilson, The Diversity of Life

    June 15, 2015