Polar Creatures Essay Postcard

The polar regions are cool in summer, but very cold in winter, and there are permanent days and permanent nights. Because of the severe cold climate, there are few plants growing in the polar regions, only cold-resistant moss or tundra, so there are few places to hide. So many creatures are white, which is convenient for hiding from predators or hunting prey. Polar creatures are usually fat, and the rich subcutaneous fat allows them to have enough calories to fight the severe cold climate. little white whale Beluga whales are known for their rich and varied songs, such as gags, sharp snaps, ticks and clucks, and early whalers called them "bird of the sea." They are expressive, attractive and can be trained, so they are one of the stars of Sea World, and many areas where beluga whales are concentrated have become popular whale watching places. polar bear Polar bears are the most representative animals in the Arctic region. Healthy polar bears have extremely thick fat and hair, and they are also good swimmers! They mainly catch seals on sea ice for food. However, due to the greenhouse effect and habitat destruction in recent years, the number has decreased rapidly. Narwhal The narwhal's unicorn reminds people of the legendary unicorn, and the unicorn is actually the tusk of a male unicorn, which is used to sense changes in salinity, temperature and pressure. Although narwhal dentists have always been a high-priced export from the polar regions, fortunately narwhals are still abundant and not considered an endangered species. sea angel Sea angels live under the ice in cold sea areas such as the North Pole and Antarctica. They are about 2-3 cm long and very small in size. Their crystal clear appearance and their swimming movements seem to be like angels flapping their wings, so some people call them ice sea angels. king penguin King penguins are the second largest of the penguin family, after emperor penguins. The scientific name of the king penguin is "Aptenodytes", which means "loon without wings" in ancient Greek. seal Seals, sea lions, and fur seals are often confused. Seals have no outer ears and their hind limbs have degenerated, so they can only crawl slowly on land with their upper limbs. The pups have beautiful white fur, and this valuable white fur often makes them the target of hunters. walrus Walruses mainly live in the Arctic Ocean and are very large, weighing 1-2 metric tons. Walruses have a thick layer of subcutaneous fat, which helps them withstand cold weather. Moreover, the skin color of walruses on land is different from that in seawater (the skin is Brown red on land, but white in water), because in water, the blood vessels shrink and squeeze blood from the subcutaneous fat layer to reduce the loss of heat. drain.