The message
from "David Hill" contains these
words:

In the UK game keepers put down poison for rats the rat bait is put inside
pipes so that most wild life cant get at it, but the rats are happy to go
into the tubes for it.

If you use a rat (kill) trap, you can also place it in a pipe or
tunnel with two open ends alongs an outside wall; the kind of runway
rats seek out. The tunnel can be a row of bricks with a plank lid. This
also prevents your child/dog/cat hurting themselves with the trap.

Janet