Chen Xiao, who works in the Forbidden City, and her colleagues found a strange "cat" in the Forbidden City. They estimated that it was a stray cat that accidentally entered the palace. After sterilization, the cat entered the Imperial College and got a new name: Yiru. Yi Ru's face is black and looks a bit "mushy". A staff member said that if you take a photo of it, you can't see if it is open. Some cats are native palace cats, such as rhubarb. In 2005, rhubarb was born in the Palace Museum. A teacher in Xiao Chen found it in the corridor of the building. He was only two months old, so he took it back for adoption. At present, rhubarb 15 years old, which is equivalent to a human life span of about 75 years, is really rare.