It's probably been about forty five years since I've shot rats at a city dump. That really brings back memories.
The most memorable shoots would be on cold, crisp fall nights, after dark. Usually there were little fires burning all over the dump and that created that never to be forgotten odor....of a burning garbage!
If you would remain quite, you would hear the "tinkle" of broken glass and tin cans as the rats ran through the dump. Then just put a flash light on the "tinkle" and you would have one of them little buggers in the beam. Next, send him off to rat eternity and revel in that smell of rim fire ammunition.
(Do you guys remember what .22 ammo used to smell like? It not the same today. As a kid I used to pull the bullets and powder out of a rim fire and then ignite the primer. The best way for me to describe the odor was that of "grapefruit"!....Ah, just a little side note and digression........)
I think that days of rat shooting at the public dump are over for ever. I don't even know of one you could get into today...at night. My last experiences were at dumps in small, rural communities.