Unexplained deaths of birds and dolphins in Peru

In this April 6, 2012 photo, a scientist take photos of dolphin caracasses 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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Peru's government declares a health alert along its northern coastline after at least 1,200 birds and an estimated 800 dolphins have washed up dead in the same area in recent months.

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