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Write a polar bear investigation report
Fossil research shows that polar bears evolved from southern brown bears about 200,000 years ago. At that time, brown bears often entered the Arctic areas in search of food. Over time, in order to adapt to the environment, the brown bears' genes mutated and their hair turned white. This not only improves their cold resistance, but also increases their own concealment, making it easier for them to survive in the Arctic. Polar bears are the largest of the bears. It can be seen from actual observations that the individuals of the same species will be larger in colder areas. This is because the larger the individual, the easier it is to keep warm, just like a bucket of boiling water cools more slowly than a bowl of boiling water. Because of this, the Malaysian black bears living in the tropics are much smaller than polar bears. This is also called the "Bergmann's law." Polar bears mainly live on the ice caps of the Arctic Ocean and feed on seals, especially ringed seals. Sometimes, they also go to land to rest, feed and raise their young. The fur of polar bears is tubular and hollow, like a thin tube, which not only reduces weight, enhances warmth, but also increases buoyancy when swimming. Therefore, all polar bears are good swimmers, and they have no problem swimming hundreds of kilometers in the cold Arctic Ocean. In order to catch seals, polar bears have developed a lot of skills. It has been observed that the instantaneous speed when they pounce on prey can reach 200 kilometers per hour. Moreover, their teeth are sharp and powerful, and their curved claws are like a row of sharp iron hooks. Once the prey is caught, it is difficult to escape. During the Antarctic expedition, the most terrifying thing is the snowstorm and extreme cold, not the wild animals, because no animals will threaten your life. Penguins are very friendly. When they see people, they will rush over to see what you are doing. But in the Arctic, in addition to severe cold and snowstorms, people must beware of sudden attacks by polar bears no matter where they are. Traveling to the North Pole alone In 1991, I traveled to the North Pole alone and flew alone to Barrow, the northernmost town in Alaska. As soon as I got off the plane, someone told me that an Eskimo boy named Stocker was eaten by a polar bear. I was shocked after hearing this, but still a little skeptical. The man took me to a house, pointed to a fresh bear skin and said to me: "This is the skin of a man-eating polar bear. It has been killed by hunters." I felt very complicated at the time. I am afraid of being eaten by polar bears, but I also want to see this behemoth called the "King of the Arctic" and see what it looks like. Later, I stayed at the American Arctic Scientific Expedition Base. One day, I am going on a field trip. The Eskimo boy who accompanied me, Hai Rui, took out his shotgun and loaded the bullet, as if he was going to the battlefield. I was a little dissatisfied and thought: "How can there be so many polar bears? Why are they so nervous?" I was thinking as I opened the door. I looked up and saw a few big words written on the door: "Have you got your gun?" ?" I was stunned for a moment. After I stepped out of the door, I saw another big sign: "Have you loaded the bullet?" Then I realized that Hai Rui was not making a fuss, but was acting according to the rules. That night we both stayed in a tent. Hai Rui inserted several wooden poles around the tent, and then wrapped a white wire around it, which was 30 centimeters above the ground, encircling the entire tent and connecting it to an alarm. Hai Rui explained: "This is an early warning device. Once a polar bear touches it, the bell will ring." When sleeping, he put the shotgun within reach and said with a smile: "We must do it at any time." Be prepared, polar bears may not come to visit you anytime." Source: Encyclopedia Knowledge
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