But according to an article published by the Russian environmental protection department on telegram, the cause of death of these seals is natural, and the death time may be several weeks ago.

Recently, about 2,500 seal corpses were found along the Caspian Sea coast in southwestern Russia. Unfortunately, this number may still be growing. But according to an article published by the Russian environmental protection department on telegram, the cause of death of these seals is natural, and the death time may be several weeks ago.

The Caspian Sea is the largest closed body of water in the world. It used to be here with beautiful scenery. There are more than 400 species that live here. The sturgeon here is famous all over the world for producing roe. Once more than 90% of the world's caviar came from here.

However, since the mid-1990s, neighboring countries have developed oil and gas here, various emissions and leaks in the process, as well as untreated waste from Volga River , (half of Russia's population and most of the heavy industry discharged its sewage into the Caspian Sea), making the water quality and environment here worse and worse. In Kazakhstan, water contaminated with petroleum products is still used as drinking water. The incidence of hematologic diseases, tuberculosis, and other diseases in the local coastal areas is four times that of the average in other parts of the country.

Caspian Sea Seal is the only marine mammal in the Caspian Sea and does not exist anywhere else in the world. These seals have likely been isolated from other seal species for at least one million years. Unfortunately, in the 20th century, they were hunted on a large scale and their number dropped sharply due to their trade in animal products such as fat and fur. Since 2008, International Union for Conservation of Nature (IUCN) has listed Caspian Sea seals as a red list of endangered species. Their estimated number has also dropped again and again, from the estimated 170,000 in 2012 to about 70,000. This large number of deaths undoubtedly made this endangered species worse.

In the past, the biggest threat faced by Caspian seals was the death of being caught by illegal poached fishing gear. However, in addition to this reason, around 2000, the Caspian seal population also experienced many outbreaks of canine distemper, which also caused a large number of deaths. Secondly, many institutions believe that the water pollution here destroys their immune systems and kills these cute animals. However, through anatomical analysis, the research institute found that this time they did not die from heavy metals exceeding the standard or disease. So, what exactly caused the death of these animals? There is no definite answer at the moment. Some scientists believe that climate change, the reduction in ice surface caused by rising temperatures, may also be one of the causes of death in the species.

In recent years, with the strengthening of awareness of environmental pollution hazards, countries around the Caspian Sea have been legislating the pollution behavior around the Caspian Sea to protect the ecology and animals there. However, due to the lack of regional cooperation between Caspian countries, it is still difficult to protect the ecological environment. And these dead seals, although there is no sign that they are killed or poisoned, the more large-scale deaths like this, the more people worry. This is a very difficult question. This has to make people wonder that they may have encountered some horrible situations, but we still know nothing about it for the time being.