Birds stand on the shores of the Cerron Grande reservoir in El Salvador
Source: Reuters
Birds stand on a tree on the shores of the Cerron Grande reservoir, one of El Salvador's main destination for migratory birds April 22, 2007. Scientists are looking into why migratory birds are choosing one of El Salvador's most polluted bodies of water as their temporary home. Picture taken April 22, 2007.
REUTERS/LUIS GALDAMEZ
REUTERS/LUIS GALDAMEZ
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