Crocodile is a very fierce animal, from the appearance of their appearance is very fierce, in addition to their character is also very ferocious. However, in the process of observing them, researchers have found a phenomenon of tears. Even when they have just caught and eaten some animals, they will cry. The phenomenon of tears and ferocious crocodile is not suitable, so people will use "crocodile tears" to describe those hypocritical people. In fact, crocodiles are not as "hypocritical" as described by human beings, and their tears are just a normal physiological phenomenon.
Crocodile tears, this is a normal physiological phenomenon. Researchers have collected crocodile tears and observed them, and found that they contain a lot of salt. The purpose of crocodile tears is the same, in order to discharge excess salt from the body.
Humans can flush excess salt out of their bodies through their kidneys and sweat glands, but crocodiles can't. The function of their kidneys is not perfect, and the function of excreting salt is naturally imperfect, and they can not excrete salt through sweat glands.
Crocodiles have specialized structures called salt glands. This structure has a catheter in the center and many thin tubes around it, which are connected to the blood and carry the salts in the blood. The central duct is right next to the crocodile's eye, so it will drain all the salt out of the blood through tears. In our eyes, it seems that crocodiles are crying, but in fact they are not really crying, nor do they contain any special emotions.
