In this April 6, 2012 photo, officials stand next to dolphin carcasses on the shore of Pimentel Beach in Chiclayo, Peru. Scientists and Peruvian officials are investigating a mass die-off of hundreds of dolphins along the South American country's coast. (AP Photo/Nestor Salvatierra)

Associated Press
In this April 6, 2012 photo, officials stand next to dolphin carcasses on the shore of Pimentel Beach in Chiclayo, Peru. Scientists and Peruvian officials are investigating a mass die-off of hundreds of dolphins along the South American country's coast. (AP Photo/Nestor Salvatierra)
In this April 6, 2012 photo, officials stand next to dolphin carcasses on the shore of Pimentel Beach in Chiclayo, Peru. Scientists and Peruvian officials are investigating a mass die-off of hundreds of dolphins along the South American country's coast. (AP Photo/Nestor Salvatierra)
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