Elementary School Knowledge King (New Century Edition) - 4 Books in Total

Author: Wen Wenbian / Country:
Publisher:
Publish Date: 2004-01-01
Features: Perhaps many children would ask, how fast could dinosaurs run? This is a very interesting question. Since dinosaurs are extinct, scientists can only analyze based on their footprints and other evidence. According to fossil analysis, the running speed of Tyrannosaurus rex was about 40-50 kilometers per hour, similar to that of a rhino. The fastest runners were small dinosaurs, with footprint analysis suggesting speeds close to 70 kilometers per hour, but it is unknown what kind of dinosaur this was. Large sauropods like Brachiosaurus ran at about 5-8 kilometers per hour, showing how clumsy they were. Scientists believe that the fastest dinosaurs had long hind legs and a slender, agile body. The high-spined toothed dragon found in the UK and the dinosaur found in South Africa were both fast herbivorous dinosaurs. Although dinosaurs could run, they would tire quickly because most of them were too large, and running was not their specialty. In nature, various animals have gradually developed various forms of camouflage over generations of long-term evolution and adaptation to harsh environments, blending their body colors with the surrounding natural environment to avoid attacks and injuries from predators. The chameleon, also known as the agama, is a reptile that is an expert in self-protection. Chameleons usually live quietly on branches, though unassuming, they can change their color 6-7 times within a day. On the skin of a chameleon, there are various pigment cells storing yellow, green, blue, purple, black, and other colors. Once the surrounding light, temperature, and humidity change, the color of the chameleon's body will also change accordingly. Scientists have imitated the color-changing surface of chameleons to create a military uniform that can change color automatically while always matching the surrounding environment. This uniform is made of a fabric woven from a chemical fiber that is very sensitive to light changes. When soldiers wear this uniform, they do not need additional camouflage while hiding. The lemming is a small rodent living near the Arctic, with a body length of about 10 centimeters. This small animal is unremarkable and has nothing particularly noteworthy about it, but it has a very strange habit of migrating in groups to the sea and drowning, which is extremely rare in the animal kingdom. Scientists have been seeking the reason behind the lemmings' "suicidal" leap into the sea. They found that lemmings have a regular pattern of large-scale clustering every 3-4 years. This is because after this period, due to the large reproduction of lemmings in Northern Europe, their habitat becomes overcrowded, and food becomes scarce, forcing them to seek food outside. Interestingly, the migration route of lemmings is almost always facing the sea. If they encounter lakes or rivers along the way, they swim across them, and upon reaching the sea, they still do not stop and jump into the ocean one after another. When scientists speculate on the motivation behind this behavior, they believe that this may be because lemmings treat the sea as another lake or river, thinking they can swim across, but the result is a tragedy. However, this is only speculation, and the true reason is still unknown. We all love the fragrance, and some animals release it. Do you know which animal is the most fragrant in the world? The musk deer, also known as the musk deer. Its body is similar to a deer but smaller, and it is the smallest and most primitive among deer species. Musk deer are widely distributed, ranging from Siberia in the north to Nepal in the south. China also has many species of musk deer. All musk deer, both male and female, have gallbladders, while other deer species do not. Musk deer, both male and female, do not grow antlers, but males have long, 7-9 centimeter tusks, making them stand out. Below the navel of a male musk deer, there is a remarkable gland that secretes a liquid with a strong, intense, and long-lasting fragrance. This liquid, known as musk, is not only exceptionally aromatic but also very strong and long-lasting, and can be detected even from kilometers away. Normally, male and female musk deer live separately. However, during the early winter each year, it is the time for male and female musk deer to mate. At this time, male musk deer secrete more musk, and the fragrance they emit becomes stronger. Female musk deer, upon smelling the fragrance, quickly find male musk deer for dates and mating. Musk is a high-end fragrance and also a valuable medicinal material, with functions such as antibacterial, anti-inflammatory, calming the mind, and detoxification.