By and by, as the night deepened, the larger beasts of the forest made their appearance. The tall graceful heads of giraffes were seen over the tops of the bushes; tigers made their approach, singly or in pairs, with their stealthy and noiseless step; lions stalked proudly down, as though they felt that the sovereignty of the woods belonged by natural right to them; occasionally the ponderous bulk of the rhinoceros might be discerned, as he sucked in the refreshing water with his huge misshapen snout, and retreated with a grunt of satisfaction when his appetite had been appeased. Frank and Nick looked on with ever-increasing interest, though it needed Kobo's oft-repeated remonstrances to keep them from discharging their rifles at some of the larger specimens, which came within tempting distance of their fire. It was nearly midnight, and the shores of the pool were beset by a crowd of animals, consisting mostly of the larger beasts of prey, when a sudden sensation of alarm seemed to agitate the whole of the miscellaneous group. The giraffes lifted their stately heads, snuffed the air for a moment, and then bounded silently away; the panthers and nylghaus moved more slowly off; the lions uttered low growls, apparently of dissatisfaction, but nevertheless followed the retreat of the others. Even the sullen black rhinoceros, after bending his head awhile to listen, beat a leisurely retreat, viciously snorting as he retired. In a few minutes the shores of the pool were as still and vacant as they had been when the boys arrived, five or six hours before. "What does this mean?" asked Nick in a whisper. "What have these brutes seen or heard, to alarm them so? Are your countrymen on their way to attack them?" "No, it not that," answered Kobo, in the same subdued accents. "Beasts hear elephant coming down to drink. All get out of elephant's way. He king among them. Listen, you hear them." "Do you really mean it, Kobo?" asked Nick, astonished at this information. "The lions and rhinoceroses can't really be so much afraid of the elephants as that comes to?" "I believe it's true," said Frank; "I know I've been told so before. A lion or a rhinoceros wouldn't mind a single elephant much, I dare say; but it's the whole troop of 'em together that they're afraid of. They'd run right over a lion, or a rhinoceros either, and trample the life out of them, before they knew where they were. Yes, Kobo's right. Here they come over that low bit of hill there. What a lot! and what thundering big beasts!"