Where I live we have a massive rat problem - in both senses of the word. Our council decided to radically reduce our waste collections to once a month, from Monday one black bag per building, cos that’ll help loads

(and they’re doing away with that section of environmental health as well, gotta save them pennies)
I reported ours to the council and all they did was have a go at people - those with bird feeders were made to get rid of them, those putting waste out before collection (literally, none of your popping your waste out before the lorry heads down the road for us, nope we gotta be up at 5:30am and sit by the window on the off chance they turn up before 6pm) and those not taking in their waste when it’s not been collected
Ours are huge, I know smaller ones can manage drain pipes and scale walls so that’s something to keep an eye out for. Ours cant. They’ve no need anymore.
You know it’s bad when they literally sit there staring you down, even during the day, as if YOU are the vermin, despite taking a broom to them and yelling. Eventually it, literally, wandered off. No doubt muttering to itself ‘who does she think she is?!?’. It was distinctly unimpressed by my attitude.