No need for them here,,,
But I have watched a few vids on YouTube ,,of ferreting in lanzerote,,and the Canary Islands ,,and they do it with string,,and I must say it was done in a very slick manner,,and the ferrets were very well handled ,as they didn't struggle ,,,I suppose using ferrets there in the rock holes,,and lava fissures ,,,it makes sence,,,and I assume no natural preditors ,,,although I'm sure there would be rats there