1. How did Flaming Mountain get its name?

The Flaming Mountains were known as Red Stone Mountain in ancient times, and during the Tang Dynasty, people called them "Volcano" because of their extreme heat. The entire mountain is composed of red granite that reflects sunlight, giving it a reddish-brown appearance like flames, hence its other name, Red Mountain. It is the hottest place in China, with summer temperatures reaching up to 47.8℃ and surface temperatures exceeding 70℃.

2. The world's largest cluster of sinkholes

The largest group of sinkholes is the karst funnel group, also known as the Leye sinkhole group. It is located in Leye County, Guangxi, China, covering an area of ​​about 20 square kilometers. There are 28 sinkholes discovered so far. Of the 13 super-large sinkholes in the world, 7 are located in Leye, which is unique in terms of both quantity and distribution density.

3. The world's longest cave

The longest cave is Mammoth Cave in Mammoth Cave National Park in central Kentucky, USA. Named after the ancient woolly mammoth, it is a World Heritage Site. As of 2006, the explored length was nearly 600 kilometers, and its exact length is still being explored.

4. The world's roundest lake

The world's roundest lake is Lake Bosunvei, also known as Lake Bosumtui, located in the Republic of Ghana in West Africa. It is so round that it looks as if it were drawn with a compass, with a diameter of 7,000 meters. The lake basin is a perfect cone shape, and the deepest point in the center of the lake can reach 70 meters. Its circumference rises symmetrically to the shore.

5. The largest mammal

The largest mammal in the world is the blue whale, weighing approximately 170 tons and reaching a length of about 30 meters. Its head is so large that 50 people could stand on its tongue. Newborn calves weigh 2.6 tons and are 7.5 meters long. Blue whales reach adulthood after about 5 years, and adults typically live for 50 to 80 years.

6. The world's smallest land mammal

The world's smallest land mammal is the shrew (quqing), a small animal that feeds on insects, spiders, earthworms, etc. It looks a lot like a mouse, but it is not a mouse. It is 5 centimeters long, and its tail alone is 2.5 centimeters long.

7. The animal with the thickest fur in the world

Sea otters have the densest fur among mammals, with 100,000 to 400,000 hairs per square centimeter. They are 130-150 cm long, weigh 30-50 kg, and have a tail length of 30-40 cm. Males are slightly larger than females and they are distributed in the cold waters of the North Pacific.

8. Wild animals that give birth to the most children at one time

Among wild animals, the one that gives birth to the most offspring at one time is the tailless hedgehog, a mammal found on the islands of Madagascar and the Comoros Islands in Africa. It can give birth to up to 31 offspring at a time, but usually, a tailless hedgehog gives birth to 12 to 15 offspring at a time.

9. The mammal with the longest gestation period

The mammal with the longest gestation period is the Asian elephant, averaging 609 days (more than 20 months), with the longest reaching 2 years.

10. Longest-lived mammals

Elephants are among the longest-living mammals, living up to 60-70 years. Captive elephants live even longer than wild ones; there have been reports of a species of long-lived elephant in the Golapas Islands living to 180-200 years.