1. Climate change. According to this version, the death of whales due to a change in ocean currents bringing colder water from the Antarctic. Whales swim in shallow waters to keep warm.
2. Pollution of the oceans.
Proponents of this version claim that in the respiratory tract of many whale, beached on the shore, was discovered oil and even polyethylene.Opponents of this hypothesis argue that many whales suicide had a net respiratory, and water in their places of "suicide" does not contain petroleum products. Radiation in the area where the whales also marked fiction. Thus, the hypothesis that the cause of death for whales is pollution, a little similar to the truth.
3. Disease. Whales too, sometimes get sick. Scientists suggest that the reason for the release of whales can be parasites that settle in the bodies of animals and damage vital organs. It is possible that the reason lies in mental illness of the leader – leader "crazy" and the whole pack rushed after him.
The whales always come to the rescue of relatives from his pack. If one of the whales mistakenly wandered into the shallow water, he immediately begins to give signals relatives and those rush to the rescue. Alas, the whales, instead of trying to save a comrade, they themselves are in trouble.
5. Crowded but mind.
Japanese scientists have proposed a version: when the population becomes too numerous whales, whales self-destruct. Due to this self-regulation, the number of whales always remains within specified nature. However, many environmentalists strongly oppose this version, considering that the popularization of this hypothesis may lead to the resolution of the resumption of whaling.
6. The failure of the compass.
Whales perfectly oriented in the ocean, so biologists say that in the brain they have a magnetic compass, making these sea creatures can use the Earth's magnetic field. If whales occurs before the geomagnetic obstacle, their inner compass goes down, and they begin to sail the wrong way. It is known that the rescued whales often re-beaching. Perhaps this is due to the failure of the compass – the whales back into the water, but to navigate I can't.
This theory is most popular today. Scientists say that whales and dolphins are ruining the deafening roar of submarines. Losing hearing, whales cease to navigate and beaching. The research bodies of the beached animals gave grounds to assume that the cause of suicide is caisson disease (decompression sickness). This ailment occurs when there is a sharp decrease in external pressure.Caisson disease is called the disease of divers, pilots and workers in caissons (underwater working chambers).
Unfortunately, the destruction of whales remains a mystery. However, scientists continue to conduct research and perhaps soon they will find the answer to this painful issue.