A hippopotamus in Taiwan Province Province broke its teeth and even shed tears because it fell off a car, which made people very sad. According to Taiwan Province's United Daily News, A He, a male hippo from a ranch in Taiwan Province Province, was thrown out of the car and fell into the driveway on his way back to Taichung from Miaoli. On one occasion, he could hardly hold himself back and fell down. It is suspected that his broken tooth and leg hurt too much, leaving two obvious white tears. It can really be said that "men don't flick when they have tears, just because they haven't reached the sad place yet."
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Tears are originally used to secrete salt. Some mammals, reptiles and birds living in the marine environment have lacrimal glands. Turtles and seabirds shed tears, leaving sparkling salt after drying. Mammals with lacrimal glands seem to be related to marine life, and even this is regarded as strong evidence that people evolved from sea apes.
We humans will cry when we are sad, and we will cry when we are happy. This is a response to brain commands. Also, when you fall into the dust in your eyes, you will also cry, in order to wash away the debris. In a word, tears can protect eyes.
People's Daily Online-The touching story of hippo's broken tooth and tears in the animal kingdom (Figure)