A gap under the kitchen door allowed rodents easy access
Bins should be made of metal and have tight fitting lids. You can see teeth marks on this bin lid where rats have been “cleaning their teeth” after feeding
I left my keys in the gap below this door which is used as a bin store. All this door does is prevent cats reaching the rats feeding in the bin area (that is besides making things look pleasant).
Our habit of building along streams means the are always plenty of rats to replenish
Why is it that builders rarely backfill holes after making them. Rats used this soil pipe ducting as a safe route to different floors in the building.