A group of ostriches march across the savannas of Southern Sudan.
An estimated 2,800 ostriches are thought to inhabit the region. The giant birds are among the dozens of animal species recently found to have survived a devastating 25-year civil war.
According to aerial surveys, other species that survived in viable populations include lions, leopards, gazelles, lesser kudu antelope, hartebeest antelope, oryxes, crocodiles, and hippos.
A herd of some 30 giraffes was also spotted just across the Nile from Juba, the capital of Southern Sudan.
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Photograph by Paul Elkan, ) 2007 National Geographic/Wildlife Conservation Society