Lockdown has made London a boomtown for rats
https://edition.cnn.com/2021/02/25/uk/rats-rise-lockdown-london-intl-gbr-scli/index.html
When an old house near my apartment was dismantled, I found a couple of spiders and cockroaches in my apartment.
So, insects and small animals tend to live in old houses, especially without residents. We have to pay attention to the situation of dismantling nearby houses.
