just reading through the replies, your getting more saying "too big" or "kill underground" etc
for your own peace of mind, and your ferts, get out and try them, I know you aint got a locator, which is why I said in my earlier post, find a small warren, 5 or 6 holes
I had a customer complaining of rabbits in his walled garden, above ground signs made the warren look empty, put two yes TWO jills in, let them run through every hole and NOTHING,did this quite a few times to be sure, just before walking to the next part, I thought Id let "ted" have a run through, as it was rather a hot day, an