Not many rats around my place, the dog would put a lot of pressure on them along with the hawks and other wildlife. I’m fairly certain skunks, raccoons and possums hunt rats and mice and those animals are around aplenty.
As far as knives go most of the time I carry a small pen knife in my watch pocket and that’s it. If I need a bigger knife I have a folder in my edc and a fixed blade in my ghb/bob. Then there’s always a knife floating around the glove box in the truck. I wasn’t really trying to collect knives for a hobby but I ended up with collection anyway. If I’m home there are pocket knives in every other room of the house laying in drawer’s and sheath knives in my gear storage area, and old kitchen knives in the garage. Maybe I need a table at the flea market.