November 21, 1992 (, Ren Shen on October 27), Ecuador dolphins collective suicide. 21,

1992 11 Ecuador marine MAMMALIA Institute revealed that, in the the km 560 the capital of Jiduoxinan direction Chang Dewy Beach the 57 dolphins collective suicide.
According to the institute's experts say the dolphins suicide is rare in this kind in Ecuador for the first time. Currently no scientific explanation for this phenomenon. It is believed that the changes in the temperature of the sea water, marine pollution and the fierceness of the storm may be the main cause dolphin suicide.