if you have a Backyard, setup a Rat feeder station, easy to make, Just a Back stop board thick enough to stop the pellet and a base board to smear Peanut butter on, mount the two boards to make an "L" then hang or mount the platform somewhere that Rats would frequent within sight of your shooting spot... (Backdoor, Window, etc) make sure it is safe to shoot in that direction ie: additional backstops....... get a Ding donger (Wireless security motion detector) from Harbor freight tools, Mount the sensor pointing at the feeder and the receiver in the house, they are battery powered and then Wait for the action, it's best to allow Rat to feed at the station for about a week so they get use to feeding there, then start picking them off.
or if you can get a permission from a Dairy, Pig farm or Chicken farm, rats love to invade those places by the thousands.......even Avocado groves, nut groves, Date Palm trees..... Dumps.
