It can be seen from The Butler, Wood Fire with Money and Slave Looking for Soldiers.
Because the mouse tries not to show his feelings, when others find that the mouse has become irritable, rude or reckless, they know that the mouse is upset. Of course, there are also some rats who are very talkative. Rats are active and diligent, and your anger is mainly caused by the laziness and waste of others. The negative side of rat people is that they like to gossip about small things, criticize others, care about things, find fault and bargain. Rat people often buy things they don't really need, and they are always cheated in bargaining. Maybe this is the accumulation desire of mice.