Tigers are large cats of mammals. The coat is light yellow or brownish yellow in color, and full of black striations; The tiger has a round head, short ears, strong limbs, and a thick and long tail with black rings. There are nine subspecies of tigers, and the size and morphology of each subspecies vary greatly.

Among them, the Siberian tiger is the largest, with males reaching a length of 3.7 meters and a weight of 423 kg. The Sumatran tiger is the smallest living subspecies, with males 2.34 meters long and weighing 136 kg.

Tigers have very good night vision. According to zoologists, tigers have about 6 times more night vision than humans, and their powerful night vision ability allows tigers to hunt easily in the dark, greatly enhancing the competitiveness of tigers at the top of the food chain.

Although tigers are known as the "king of the forest", they do not live only in the forest as everyone thinks. They are very adaptable to the environment, and their footprints are widely distributed in many countries in Asia, and the number of tigers living in Southeast Asia is relatively small compared to the number of tigers living in India, Nepal and Bhutan. Usually, tigers in cold regions live in taiga forests, and tigers in warm areas prefer to live in arid forests, rainforests and grasses.

Tigers are solitary animals with a strong sense of territory. Usually, each tiger has its own territory, also called a habitat. This habitat has a certain range. Tigers often coat a liquid with a special odor to trees at the boundary of their habitat to alert or warn other tigers.

In nature, many animals evolve a camouflage color in order to survive better. As we all know, chameleons, their skin color will change at any time depending on the environment. Some animals have camouflage colors to hunt better, like some fish in the ocean, they will disguise themselves as stones and prey unexpectedly. Some animals use camouflage colors to avoid being hunted and killed, so as not to become food for other animals. So why do tigers have no camouflage color in the mountains, but a bright golden yellow?

In fact, tigers choose golden fur, which also has its evolutionary adaptability. Because the target prey of tigers, such as deer, horses, and sheep, are basically "red color blind". Not only are deer, horses, and sheep colorblind, but in fact, most mammals cannot see bright red-orange. So for the herbivores on the grassland, they are really not easy to distinguish between the color of the tiger's coat and the color of the surrounding environment.

The size of the tiger is much larger than that of the human, so the stomach of the tiger is much larger than the human stomach. We can usually see tigers in zoos that are not only very large, but also eat a very large amount, so the tiger's stomach can hold a lot of food. These foods can provide a steady stream of calories to tigers over a month. Humans are different in that their stomachs contain limited food and can only provide energy for a short period of time. The tiger's digestive system is different. The tiger's digestive system is digested according to the food and the amount of exercise the tiger does. The more the tiger moves, the more the food will digest, and the less the exercise, the less the food will digest, rather than digesting it all at once.