Tash

it's most likely possums in the roof having a party up there. Just set up cage traps.

a M2 or M14 would be my first choices. Otherwise ratsak is fine if you are willing to put up with the smell if it dies between the walls or in a place you can't reach.

We think it might be rats Buff as the dogs have caught 3 outside - they are just too clever for the traps we have set!

I am liking the M14 idea :D But yes, copious amounts of ratsak will have to do it.