Anyone run a trap line?

I had one here in Australia for fox, but they built a housing devleopment on the piece of property we were trapping foxes on and I had to shut it down. Got a couple, but then the bastard developers bought out the ranch and turned it into 1/8th acre lots.

I am surrounded by Capitol Territory National Park lands so I can't trap anywhere else close to the house.

I had a heck of a good beaver and mink line when I was a kid in Montana.