Eye of the world

On Earth Day, we find ourselves floating above a small forest lake reflecting the clouds over Karula National Park, the smallest national park in the smallest Baltic nation, Estonia. The ghostly outline of white trees surrounding the water might suggest they are diseased, but in fact they are evidence of a thriving beaver population. They build so many dams, the water level rises and floods the forest floor, rotting the roots of trees around the shoreline.
© Sven Zacek/Minden Pictures