"Desert boat" camels are the most well-known animals living in the desert. They are tall and brown in body hair. They can endure hunger and thirst, and can survive without water and food for up to 2 weeks.

The camel's hump stores fat. When they can't get food, they will decompose the fat in the hump into nutrients needed by the body for their own survival needs. In addition, the camel's stomach has many small bubbles in the shape of a bottle, which can be used to store water.

The desert can be said to be one of the most unsuitable environments for plants on earth, but there are exceptions to everything, and cacti can survive in the extreme environment of the desert. However, I believe that most people don't have a good impression of cacti, because they are covered with thorns, and these thorns are very sharp, and they can cut our skin with a little carelessness. In fact, these thorns are the self-protection skills evolved by cacti, which can effectively prevent some animals that have bad intentions towards them.

Facts have proved that the self-protection methods of cacti have achieved good results. Many animals will not take the initiative to approach them, so that they can live in the sun in the desert, but not all animals are helpless against cacti, such as camels.

When the camel saw the cactus, it would not run away, but rushed directly in front of the cactus and ate the cactus with big mouthfuls. Those long and sharp thorns in our eyes seem to be non-existent in the camel's eyes. This makes one wonder why a camel can eat a cactus without getting a thorn in its mouth. In fact, although cacti are tough and thorny on the outside, if you cut them open, you'll find that the inside of the cactus is tender and juicy. Although camels do not choose to eat cacti when they have other food, for them who always walk in the desert, cactus is indeed a rare "life-sustaining medicine".

Yes, the camel's tongue is indeed very soft, but when the camel swallows the cactus, the soft tongue will be flat, and the cactus is chewed with its mouth covered with serrated spines. Chew the cactus with these fleshy spines, as if the cactus were massaging the camel's mouth. In this way, the cactus cannot pierce the camel's mouth, and the camel is very comfortable to eat. Also, when swallowing a cactus, the camel's tongue will also be placed flat, so that it will not pierce the mouth.

In addition to the internal processing of the mouth, the camel also has a fully functional stomach chamber. The first room is a water tank, which can hold water, so it is resistant to hunger and thirst. A camel can drink water once, and can drink no more water for half a month. This is a special function given to the camel by the desert. The second chamber is the stomach sac for eating hay, and the third chamber is the stomach sac for digestion and absorption. If a camel eats a hard cactus that its stomach for digestion often cannot handle in one go, the processed cactus is stored in another stomach, waiting to be regurgitated. Rumination is to return the semi-digested food from the stomach to the mouth to chew again after eating for a period of time, so the cactus after being chewed again is safer, and the feces formed after absorption can be smoothly excreted by the camel.

In fact, camels do not like to eat cacti very much, but there are not so many edible foods in the desert, but there are a lot of cacti, which can replenish water, so camels gradually "stared" at this kind of food.