A month or so ago I noticed a run from a corner of the hen run to the underside of the coop. We lifted one end to look and were eye to eye with what must have been a genetically modified rat it was so big

We were still grasping the heavy coop to do anything as it ran out of the run.
Invested in a couple of basic rat traps and placed some mealworm on them ( I had suggested chocolate but decided why waste it if ratty will eat something else

).
We caught ratty at the entrance of the run on the second night. Looked like it had ran through it's rat made hole straight into the awaiting trap

Nothing since but have reset a trap a couple of times just in case.