Uncover the mystery of animal suicide

  Mysterious Throwing to the
  Sea One day in 1868, the weather was clear, visibility was good, and the coastline of Norway was clearly visible in the distance. A mail ship full of passengers was moving along the waves. Suddenly, someone shouted: “Look! What is that?” Everyone looked in the direction he was pointing, and saw that the sea not far away was dark. The things that care about are wriggling.
  The ship gradually approached. People finally saw that there were countless lemmings swimming from the coast to the depths of the ocean. Many of the lemmings swimming in front of them had already sinked from exhaustion, but those who followed did not flinch and continued to flee.
  Since then, people have begun to notice that every three or four years, lemmings living in Northern Europe will come to the Norwegian Sea and the North Coast to die.
  Why do lemmings commit suicide collectively? This is a mystery that the locals have always figured out.
  Some people believe that the collective suicide of lemmings is related to their vigorous fecundity. Because the reproductive capacity is too strong and the lemmings are too much, the supply of food in the residential area exceeds the demand, and the “rats are overwhelmed”. In this case, the lemmings have to move to other places. Tens of thousands of years ago, the Norwegian Sea and the North Sea were much narrower than they are now. At that time, lemmings could swim across the sea to the other shore and establish new habitats. So over time, collective migration has become the instinct of Norwegian lemmings, passed on from generation to generation. However, the vicissitudes of life, the Norwegian Sea and the North Sea are now much wider than in the past, the lemmings can no longer swim to the opposite shore, and the endless sea ruthlessly engulfed their lives.
  But this kind of speculation is not satisfactory. Why don’t the lemmings accept the painful lessons time and time again and change their migration route? And some people have observed that sometimes lemmings also migrated northward, into the Barents Sea and the Arctic Ocean. According to this theory, then, many years ago, there was a land between the north of the Barents Sea and the Arctic Ocean?
  Suicide because of the earthquake
  One day in late January 1975, my country’s Liaoning Haicheng area was full of wind and snow, and the temperature was already minus 10°C. However, a shocking phenomenon happened in this area: thousands of snakes suddenly stopped hibernating, crawled out of their original hiding places, and froze in the ice and snow. Ten days later, a big earthquake suddenly occurred in the Haicheng area.
  Because the suicide of the winter snake attracted the attention of earthquake workers, they combined a large amount of monitoring data to accurately predict the earthquake in advance, so that the government evacuated the people in time and reduced the loss of the earthquake. Winter snake’s suicidal behavior inadvertently saved tens of thousands of lives.
  For decades, scientists have tried to find the final answer from different angles, forming three more mainstream explanations.
  Geothermal said. Snakes are cold-blooded animals. When the temperature drops below 10°C, they enter the hibernation period. When the temperature drops to 0°C, the snake will die because of blood freezing. The violent displacement of rocks deep in the earth’s crust before the earthquake produced a lot of heat, which raised the ground temperature to more than 10°C. Snakes woke up from hibernation, thinking that the spring flowers were already blooming outside. dead.
  Said to the ground. Before the earthquake, every tectonic change in the depths of the earth’s crust produced earth sounds. Snakes have a hearing that is several times more sensitive than humans. When the rumbling ground sounds continue to enter the snake cave, the snake is greatly frightened, so it starts from the instinct to defend and avoid evil, and crawl out of the cave.
  Earth Qi said. Scientists used instruments to determine before the earthquake that the strong friction of the rock formations before the earthquake would release a large amount of radon and other gases, and snakes would panic and flee when the radon content was dozens of times the normal value. Therefore, when a large amount of radon gas gathers in the snake hole, the original sleeping state of the winter snake is forcibly changed, and the snake is forced to come out of the hole in groups.
  Incomprehensible pseudo-suicide
  Turtles are reptiles live in the sea, no gills, use nose to breathe, rely on fish, molluscs and algae living. On the east coast of Florida in the United States, someone found a sea turtle buried in silt. At first, people thought it was just a turtle shell, but they discovered that it was actually a live turtle.
  Why do sea turtles bury themselves in the mud?
  Some people say that this is a sea turtle cleaning barnacles (a marine mollusk); some people say that this may be a form of hibernation of sea turtles, and others say that this is a sea turtle that is warming in the cold water.
  Some scientists have observed that when sea turtles “bury themselves”, they put their heads in the mud. Although the barnacles parasitic on their heads died due to the lack of oxygen in the silt, the barnacles on the middle of their bodies and tails are still alive.
  Robster, a member of the diving club, dived into the seabed during a training session and found a “turtle shell” exposed in the silt, as if it had been thrown away. Robster swam over and took the picture, then reached out and lifted the “turtle shell”. This “turtle shell” came alive. It turned out to be a sea turtle that “buried” himself alive.
  It didn’t take long for Robust to find another “turtle shell”. This was a big female turtle. She was not asleep, and her paws were very sensitive. Before Robust touched it, she stirred. The silt muddyed the sea and escaped. At the same time, Robust’s companions also found two large female turtles buried in the mud.
  Based on these new discoveries, some marine biologists in Florida rejected previous guesses: First of all, of the 4 “self-buried” sea turtles discovered by divers, 3 were large female sea turtles, which overthrew the big male sea turtles. The idea of ​​”burying oneself” to get rid of barnacles. Secondly, from what the divers have observed, the “self-burial” of sea turtles is a short-lived event, so it cannot be considered that they are hibernating. In addition, according to Roberts’ records, when sea turtles “self-bury”, the seabed water temperature is 21.7°C, which shows that sea turtles “self-bury” are not for heating purposes.
  Dog Suicide Bridge
  near the British Sugelandan Barton Overton Bridge, is a household name in the UK “dogs suicide bridge.” In the past half century, at least 50 dogs jumped off the bridge and fell to their deaths in a 15-meter deep rocky valley. The mystery of the dog’s “suicide” has been plagued by British scientists until recently, this mystery has been solved.
  A few years ago, when local resident Donna Cooper took her puppy for a walk on the bridge, the dog suddenly jumped over the granite railing and fell heavily on the rocks at the bottom of the bridge. The puppy’s paw broke, his jaw and back were fractured, and the doctor had to euthanize it.
  All the dogs jumped on the bridge at the same place, that is, between the last two railings on the right side of the bridge; the survey also found that the dogs all choose to “suicide” on sunny days; in addition, all the dogs jumping on the bridge have a keen sense of smell Proboscis dog-Labrador retriever, collie or hunting dog. Obviously, the dog was stimulated by sight, hearing or taste here.
  Canine psychologist David Sanders ruled out the influence of vision, because standing at the height of dogs, they can only see granite, and acoustic expert David Sexton did not detect the area. Discover weird sounds that only animals can hear. Scientists have discovered that there are mice, minks and squirrels that emit odors at the bottom of the bridge. In order to determine which animal’s scent attracted the dogs, the scientists arranged three kinds of animal scents in the wild, and released 10 dogs for experiments, and found that 7 dogs all ran directly to the mink scent!
  Minks leave stinky marks on the places they have been, and this strong odor is obviously very attractive to dogs. Since the dog could not see the ridge of the river blocked by the stone fence of the bridge, he jumped over the railing in order to track the smell, but jumped toward death.
  Whales
  on the Beach In 1976, in Florida, USA, 250 whales suddenly swam into shallow water. When the tide subsided, they were stranded on the beach. Why do these whales stranded and committed suicide? In this regard, biologists have different opinions, but the various opinions are mostly related to its echolocation system.
  The whale does not rely on its eyes to tell its direction. The eyes of a whale are extremely disproportionate to its stature. A giant whale’s eyes are only as big as a small watermelon, and their eyesight is degraded, and they can only see objects within 17 meters. But they have a high-sensitivity echo ranging ability, which can emit ultrasonic waves with a very wide frequency range, which will reflect back when encountering obstacles and form echoes. The whale judges the distance between itself and the obstacle based on the round-trip time of this ultrasound, and the positioning error is very small.
  One theory of whale suicide is that when a whale swims near the coast and emits ultrasonic waves to a slope-like beach, the echo error is very large, and even no echo is received. As a result, the whale loses its way and loses its life on the beach.
  Zoologists have found many round insects in the ears of a group of stranded orcas. Researchers believe that it is likely that this kind of parasites in the ears destroyed the echolocation system of the whales, making the whales unable to hear the echo correctly. go astray. However, some whales, such as the narwhal, often have different parasites, but this does not significantly interfere with the direction of navigation.
  Environmental pollution was once considered to be one of the reasons for whale stranding. However, when the whale was dissected, it was found that most of the dead whales had red and swollen lesions on both sides of the air cavity. It is likely that the positioning system of the whales was damaged, which made the whales quickly lost direction. And whales are animals in groups. If one whale rushes to the beach and runs aground, the rest will follow desperately, so that they get stranded one after another, forming a tragedy of collective suicide.
  Other scientists believe that the mass suicide of whales was due to underwater explosions. After analyzing a series of mass whale suicide incidents, they found that during several mass whale suicide incidents, military exercises were being carried out in nearby waters. Researchers believe that the sound waves of warships’ sonars and echo detectors and the noise of underwater explosions will disrupt the echolocation system of whales. This is the main reason why whales rush to the beach to commit suicide.