Already the little party was moving slowly across the clearing, which was covered with nervous beasts moving irritably to and fro, their whole demeanor marked by nervous apprehension. Prior to the advent of the tigers the animals had been moving quietly about, some of them grazing on the short grass of the clearing or upon the leaves and twigs of the scattered trees growing in it; but with the appearance of the first of the carnivores their attitude changed. A huge, bull mastodon raised his trunk and trumpeted shrilly, and instantly every herbivore was on the alert. And as eyes or nostrils detected the presence of the great cats, or the beasts became excited by the excitement of their fellows, each added his voice to the pandemonium that now reigned. To the squealing, trumpeting and bellowing of the quarry were added the hideous growls and roars of the carnivores. "Look at those cats!" cried Von Horst. "There must be hundreds of them." Nor was his estimate an exaggeration for from all sides of the clearing, with the exception of a single point opposite them, the cats were emerging from the forest and starting to circle the herd. That they did not rush it immediately evidenced their respect for the huge beasts they had corraled, the majority of which they would not have dared to attack except in superior numbers. Now a mammoth, a giant bull with tail raised and ears up-cocked, curled his trunk above his head and charged. But a score of the great cats, growling hideously, sprang to meet him, and the bull, losing his nerve, wheeled in a wide circle and returned to the herd. Had he gone through that menacing line of fangs and talons, as with his great size and weight and strength he might have done, he would have opened a hole through which a stampede of the other animals would have carried the bulk of them to safety. The frightened herbivores, their attention centered upon the menacing tigers, paid little attention to the insignificant man-things passing among them. But there were some exceptions. A thag, bellowing and pawing the earth directly in their line of march, terrified by the odor of the carnivores and aroused and angered by the excited trumpeting and squealing of the creatures about him, seeking to vent his displeasure upon something, lowered his head and charged them. A Waziri warrior raised his rifle to his shoulder and fired, and a prehistoric Bos Primigenus crashed to the impact of a modern bullet.