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Unexplained deaths in Peru

Dolphin carcasses are seen after being displayed by conservationists and environmental police officers at San Jose beach, north of Chiclayo, April 6, 2012.

Unexplained deaths of birds and dolphins in Peru

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.