I'm not sure what you are reading . . . . but may i suggest a change of literature?
When a ferret is scared etc, it stinks like buggery.
A good worker, really works, they are BOD's (bolt or die), and will scour that warren from top to bottom. Most (not all) ferrets will enter, and so bolt a few, but not all will really 'work'.
It's all in the breeding and to some extent the entering.
Fair enough, seems like ive been reading the wrong stuff!
thanks for the advice and clearing that up..
ATB
Rikki