The keeper does not always take his ferrets with him when he goes ratting. Usually they are too large to enter rat-holes freely, and even the small rat-ferret has difficulty in turning round. And when a ferret has once entered a hole a rat cannot pass him, and so may be prevented from bolting and showing sport. The sport takes place underground, unless the ferret retreats while there is time. The fight ends either in severe punishment for the ferret or in the death of the rat; when the ferret proceeds to gorge himself on his victim--and to lie up. Again, it is more difficult to find a lingering ferret in a rat's hole than in a rabbit's burrow; a line-ferret sent in to explore cannot move about in the small rat passages as in the roomy tunnels of rabbits, and so cannot locate the free ferret. To dig for a ferret in a rat's run is always risky; the diameter is so small that the spade may cut through without any warning, and also cut through the ferret. When the spade breaks through the crown of a rabbit's hole, on the floor of which is the ferret, the man with the spade naturally eases his pressure. But the ferret fills the rat-hole to the roof. There is still another danger in ratting with ferrets; the dogs, unless very well trained, may bring about a tragedy. Even when a dog is ferret-proof the ferret may plunge teeth into the dog, who naturally retaliates. On all these accounts the keeper may prefer to go ratting with an iron bar in place of a ferret. By using an iron bar instead of ferrets for bolting rats, all kinds of difficulties and delays are prevented; and the keeper is free to go home at any time without having to wait for loitering allies. To strike an iron bar into a rat's hole is to strike terror into the rat's heart. One might probe a rabbit's burrow with a bar for a month, and no rabbit would bolt--indeed, the more one probed the tighter would the rabbit sit. In rabbiting, a bar is used only to find holes and save digging. But thrust a bar anywhere near a rat's subterranean lair, and probably the rat will bolt, as if possessed, at the first time of asking. Such an effect does probing have on rats that they will fly before the crowbar well knowing that enemies await their appearance. Even with a dog at the hole who has grabbed at the rat more than once, the rat will fly before a shrewd thrust. The art of thrusting is to drive the bar into the hole behind the rat, not blocking the way by which it will bolt.