Thanks for the response whitecoatblackhat
Such traps are not really effective with these things - they are big at around 35cm and much larger than what you get in the US. I have heard they have specialised traps they use at the airport, but I can't get hold of those. They also used to have kill traps, but they were outlawed in SA about 10 years back and you can't purchase them anymore.
I have tried catching them myself DIY for many months now to no avail, and they are now burrowing under our building and under paving causing huge amounts of damage. Going the poison route is the last thing I want to do, but we are getting desperate.
We haven't had them in the past 10 years, and after our COVID lockdown here they moved in. I think the road was not being used ad so they burrowed under it. I think once we get rid of our current infestation they won't come back, but we'd need to see. Would not want to be doing this repeatedly...
Thanks for providing additional context.
What you're saying makes sense.
I still think that there are a few DIY traps that you can try to catch these things.
And I'm sure that a bigger mole trap that you place underground would work as well.
Have you seen this guy's YouTube channel and especially this video of his: https://www.youtube.com/watch?v=i2PSDVsZ38U
If you haven't, explore his channel to get some ideas (but I'm almost sure you've already done this).
Another thing is if you have someone in your area that has hunting dogs or even better minks, you can use smoke grenades made specifically for smoking rodents out of their burrows.
You place a few of those in their holes and get the dogs or minks to hunt them.
Have a look at this youtube search query: https://www.youtube.com/results?search_query=mink+rat