You've seen the world. But have you really?
Dr. Nandasena is an avid birder whose photographic work covers all the endemic bird species of Sri Lanka. That is not a quick thing to do. Some of these birds keep to the high canopy of old rainforest; others come out only at the edge of daylight, in ravines most visitors never see.
His broader collection takes the same way of working to the wildlife of Africa and Alaska. The subjects are larger and the landscapes wider, but the method does not change: arrive early, stay late, and keep looking after everyone else has stopped.