In some countries the bait is tied to the string, and the animal on seizing the bait tightens the string, draws the trigger, and shoots itself.

In this way, however, there is always some uncertainty as to the result.

The animal may not place its body in the proper position with regard to the muzzle, and may either escape the shot altogether, or may be only "creased," and of course get off.
The mode of setting the "gun-trap" in South Africa is a superior plan; and the creature that is so unfortunate as to draw the trigger rarely escapes, but is either killed upon the spot, or so badly wounded as to prevent its getting away.
Von Bloom constructed his trap after the approved fashion, as follows:-- Near the camp he selected a spot where three saplings or young trees grew, standing in a line, and about a yard between each two of them.
Had he not found three trees so disposed, stakes firmly driven into the ground would have answered his purpose equally well.
Thorn-bushes were now cut, and a kraal built in the usual manner--that is, with the tops of the bushes turned outwards.

The size of the kraal was a matter of no consequence; and, of course, to save labour, a small one was constructed.
One point, however, was observed in making the kraal.

Its door or opening was placed so that two of the three saplings stood like posts, one on each side of it; and an animal going into the enclosure must needs pass between these two trees.
Now for the part the gun had to play.
The weapon was placed in a horizontal position against two of the saplings,--that is, the stock against the one outside the kraal, and the barrel against one of the door-posts, and there firmly lashed.