We passed over a tract studded with small, dense patches of low scrub; it looked like a miniature archipelago in the boundless ocean of "toa." Here brown "duiker" antelopes were numerous. So far as I knew this was the only part of Bushmanland where such were to be found. As we rode on the little creatures sprang out, right and left, from the patches of cover and bounded gracefully away. Far to the south-west the herd of springbuck was now clearly visible. Most of them were quietly grazing in the mild sunshine. Now and then a few detached themselves from the main body and, one behind the other, bounded away for a few hundred yards on a course curved like the blade of a scimitar--"pronking" with the sheer joy of unspoilt life. After such an excursion they would rejoin the others and go on feeding. And I had come to... But if I had let Jekyll climb to my crupper Andries would have got no shooting. The herd was a small one; it did not number more than about six hundred. It was curious that these bucks had not joined in the general migration eastward towards where the lightning had flashed its message of rain a few nights previously. The springbucks had not seen us as yet, for we were still about two miles distant from them. The eyes of these animals seem to be specialised to a definite range as the ear is tuned to a certain gamut of sound. I will endeavour to explain what is meant by this. They do not seem to notice anything at a greater distance than about fifteen hundred yards. Conversely, should you be lying in ambush and the bucks come to within fifty yards of you, they would evince far less alarm if you shewed yourself than on seeing you at a distance of from two to three hundred yards. This can easily be accounted for. The springbuck has always spent its life in an environment of menace, but as conditions change the nature of the menace changes with them. Formerly the danger-zone for these creatures was that from which the lion, the leopard or the wild dog could spring; it was only surprise at close quarters that the springbuck had to guard against. Given a few seconds' notice of the approach of an enemy, this creature's unsurpassed fleetness enabled it to laugh at danger. This laughter is still expressed in the manner in which a small herd of springbuck will circle round and round a pursuing dog that is not especially swift--as porpoises sometimes circle around a moving ship. We know from accounts left by the very old hunters that in early days, when the killing range of a bullet was little more than a hundred yards, springbuck would graze with apparent unconcern until approached to within about that distance. But with the disappearance of the larger carnivora before firearms, and the increase in the range of the rifle, a wider danger-zone has been created, while the danger of an enemy at close quarters has practically disappeared. The width of the danger-zone has gone on increasing with the longer range of the rifle.