In this photo provided on Friday February 15, 2013 by World Press Photo, 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, November 16, 2012. (Photo by Christian Ziegler/AP Photo)
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