Also theres no point on using one ferret on large warrens, because the rabbits will just give her the run about, for large warrens use two or more ferrets, find some small burrows with five holes or less and your ferret wil easily bolt the rabbits. most people say 5 months is a fine age to work a ferret but whin has been in this game for longer than me so take his advice. i gennerally give my ferrets 40 minutes-1 hour to work a warren then start searching about for them, however if your quiet, stand well back from the warrens and approach warrens from downind you will find most rabbits bolt qu