Positioning his drone directly above the small lake, Sven waited for the sun to emerge from behind the clouds to capture the reflection of the sky in the lake’s mirrored surface. Contending with technical issues and battery-power shortage, his patience was rewarded by this image of ‘an aerial view that looks like an eye’.

Karula National Park in Estonia is home to goshawks, lynx, wolves and bears. The ghostly outline of dead trees surrounding this lake is a telltale sign of the thriving population of beavers inhabiting Karula. Their naturally prolific dam-building causes higher-than-usual water levels that flood the forest floor, rotting the roots of any trees growing close to the shoreline.