Posted: 23/02/2015 at 09:29
Rats are very clever. When something new arrives near their runs they avoid the object for a couple of weeks. Be patient, handle the traps wearing rubber gloves to hide your scent and you will have success eventually.
When I was dealing with mine it took almost 3 weeks before I caught an enoumous one, I persevered and eventually caught 5 in total, some obviously smaller and younger so I assumed they were a family.