Detail of a wall painting of the Life of the Buddha, showing Prince Siddartha encountering old age, sickness, death, and an ascetic spiritual seeker, Seoul, South Korea, Asia

Two container ships passing one another on Kiel Canal, Kiel, Schleswig-Holstein, Germany, Europe

Two container vessels passing one another on the lower Elbe River, Schleswig-Holstein, Germany, Europe

Encounter between two container ships on Kiel Canal, Kiel, Schleswig-Holstein, Germany, Europe

Sustainable tourism, camel trekking, camels, dromedaries (Camelus dromedarius), caravan encountering a group of quads, sand dunes, Sahara desert between Douz and Ksar Ghilane, Southern Tunisia, Tunisia, Maghreb, North Africa, Africa

View taken from behind of silhouettes of two blue wildebeest (Connochaetes taurinus) standing on the savanna watching a cheetah (Acinonyx jubatus) pass by, Serengeti National Park, Tanzania, Africa

Portrait of a black bear (Ursus americanus) pausing on a mountainside from feeding on lowbush cranberries and looking at the camera on a mid-October afternoon in Southcentral Alaska's Chugach Mountains, Alaska, United States of America

Portrait of a sunlit, wolf (Canis lupus) standing in the brush in the snow, Churchill, Manitoba, Canada

Portrait of a bull moose (Alces alces) walking through an alpine meadow late in the rut in Southcentral Alaska's Chugach State Park, Alaska, United States of America

Portrait of a polar bear (Ursus maritimes) standing in the snow looking at the camera, Churchill, Manitoba, Canada

Portrait of a male lion (Panthera leo) standing among bushes, looking mournful at the camera, Laikipia, Kenya

Portrait of a young, male lion (Panthera leo) standing on savanna, staring at the camera, licking his lips, Laikipia, Kenya