In this picture taken Monday, July 16, 2012, birds fly over grazing cows in the green sandy plains near Bermo, Niger, 200 kms (125 miles) north of Maradi. For generations, nomads have lived in a ... more 
In this picture taken Monday, July 16, 2012, birds fly over grazing cows in the green sandy plains near Bermo, Niger, 200 kms (125 miles) north of Maradi. For generations, nomads have lived in a precarious equilibrium with the sky above them. When the first rains come, they head north toward the Sahara desert, where the grass is said to be saltier, packed with minerals. They time their movements according to the clouds, waiting for the second major downpour, before making a U-turn to head back to the greener south. If they miscalculate, they can end up stranded. As the grass turns yellow, their animals become too weak to walk. (AP Photo/Jerome Delay) less 
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Associated Press | Photo By Jerome Delay
Sat, Aug 18, 2012 5:15 PM EDT