Arenal Volcano National Park, Costa Rica ID: 0000 0000 0406 0766 [detail] © 2006 Joseph Dougherty/ecology.org

Early colonizing plants take hold on an old lave flow on the shoulder of Arenal Volcano. ID: 0000 0000 0406 0768 [detail] © 2006 Joseph Dougherty/ecology.org

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