I live in Manhattan and have a small but nice outdoor area. They are times that rats (which are in every block of this fine city) will come and spent the night munching on my beautiful plants. When I moved in last year, I didn't know and they ate my entire garden - I had a complete garden disaster. In the fall, they ate whole huge mum plants. This year is different: I've put up chicken wire, use mothballs, etc. And have a bunch of traps. Here is an early result: