I think a simpler solution is that people and restaurants throw their trash in closed trash bins. Rats eat food which are thrown on the ground or otherwise easi

I think a simpler solution is that people and restaurants throw their trash in closed trash bins. Rats eat food which are thrown on the ground or otherwise easily accessible. I believe that some people in big cities has lost a sense of community. Thus some throw food on the ground that the rats eat. To get rid of rats cities need to be cleaner.