Officials Don't Know Why 877 Dead Dolphins Have Been Found on Beaches in PeruCasey Chan4/22/12 4:00pm63EditPromoteDismissUndismissHideGo to permalinkFrom February to April, a 2-month span, 877 dead dolphins and porpoises have been found on the beaches of northern Peru. The problem? No one knows why. It could be a virus. It could be an infection. It could be seismic oil exploration. It could be air guns. It could be nothing?