Was that what Tau had seen earlier? That quick movement around the side of the rough pillar? But if so, why the question of color? There it was again! And now, centering all his attention on that one point, the Terran picked out the outline of a head--a head grotesque enough to be something conjured out of Lumbrilo's sorcerer's imagination. Had Dane not seen its like among the tri-dee prints in Captain Jellico's collection, he would have believed that his eyes were playing tricks. It was a bullet-shaped head, embellished by two out-sized prick ears, the hair-tufted pointed tips of which projected well above the top of the skull. Round eyes were set deeply in sunken pits. The mouth was a swinish snout from which lolled a purple tongue, though the rest of that gargoyle head was very close in color to the rock against which it half rested. Dane had no doubts that the rock ape was spying upon the small camp. Having heard tales of those semi-intelligent animals--the most intelligent native creatures of Khatka--most of which were concerned with their more malignant characteristics, Dane was alarmed. That lurker could be an advance scout of some pack. And a pack of rock apes, if able to surprise their prey, were formidable opponents. Asaki stirred, sat up. And that round head above turned to follow the Chief Ranger's every move. "Above ... by the finger rock ... to the right...." Dane kept his voice close to a whisper. When he saw the sudden constriction of muscle across the Khatkan's bare shoulders, he knew that the other had heard and understood. Only, if Asaki had spotted the rock ape, he did not betray his knowledge. The Khatkan got lithely to his feet. Then one of those feet stirred Nymani into the instant wakefulness of the wilderness-trained man. Dane slid his hand about the bole of the tree and touched Jellico, watched the captain's gray eyes open with a similar awareness. Asaki picked up his needler. Weapon in hand, he whirled and fired almost in one connected movement. It was the fastest shot Dane had ever seen. The gargoyle head lifted away from the rock, and then turned to one side as its body, somehow vaguely obscene in its resemblance to the human form, fell away, to sprawl limply down-slope. Though the dead rock ape had not had a chance to give tongue, there came a cry from above, a coughing, deep-throated hawking. Down the steep incline bumped a round white ball, bouncing past the tumbled carcass of the ape, sailing up into the air, to strike and burst open a few feet away. "Back!" With one arm Asaki sent Jellico, his nearest neighbor, tumbling back into the jungle. Then the Chief Ranger pumped a stream of needle rays into the remains of the ball. A shrill, sweet humming arose as red motes, vivid as molten copper in the sunlight, climbed on wings beating too fast to be seen.