Why are there so many crows in Beijing Normal University?

What's the name near Beijing Normal University? Iron lion grave, as its name implies, was a cemetery in those days. Crows like to be around the cemetery because there are many offerings in the original cemetery. Crows eat these tributes for a long time and become crows' homes. Birds are very family-conscious animals. They have lived here for generations. Although there is no cemetery now, this is still their home.