2013 World Press Photo Winners

The 1st prize Nature Single by Christian Ziegler, Germany, shows the endangered Southern Cassowary feeds on the fruit of the Blue Quandang tree. Cassowaries are a keystone species in northern Australian rainforests because of their ability to carry so many big seeds such long distances, Black Mountain Road, Australia, Nov. 16, 2012. (Christian Ziegler/AP Photo )