There was a rustling. Saya stood beside him, trembling a little. To leave the others had required great courage. But she had come to realize that if any danger befell Burl she wished to share it. So she had come. They shared the starlight. They heard the nightwind and the orchestra of night-singers. They wandered aside from the cave-mouth, and Saya found completely primitive and wholly atavistic pride in the courage of Burl, who was actually not afraid of the dark! Her own uneasiness became merely something to give more savor to her pride in him. She stayed close beside him, not only for reassurance but also for joy in being close to him. Presently they heard a new sound in the night. It was very far away and not in the least like any sound they had ever heard before. It changed in pitch. Insect-cries do not. It was a baying, yelping sound. It rose in pitch, and held the higher note, and abruptly dropped in pitch before it ceased. Minutes later it came again. Saya shivered, but Burl said thoughtfully: "That is a good sound." He didn't know why. Saya shivered once more. She said reluctantly: "I am cold." It had been a rare sensation in the lowlands. It came only after one of the infrequent thunderstorms, when wetted human bodies were exposed to the gusty winds that otherwise rarely blew there. But here the nights grew cold, after sundown. The heat in the ground radiated to outer space at night, not being trapped by a layer of clouds. Before dawn, the temperature would be close to freezing, though anything worse than a light fleeting hoar-frost would be rare on this plateau. The two of them went back to the cave. It was warm there. The cave was so packed with humans that their body-heat kept the air from growing chill. Burl and Saya crouched among the rest, and became drowsy and comfortable. Presently Saya dropped off to sleep, her hand trustfully in Burl's. But he remained awake for a long time, blinking. He thought of the stars, but they were too strange. He thought of the trees and grass. But most of the impressions of this upper world were so remote from previous knowledge that he could only accept them as they were and defer reflection upon them until later. But he did feel an enormous complacency, what with having brought his followers to an effective paradise of safety, and having arrived at a completely satisfactory emotional status with Saya. But the last thing he actually thought about, before his eyes blinked shut in sleep, was that yelping noise he had heard in the night. It was totally novel in kind, yet there was something buried among his racial heritages that told him it was good. * * * * * Burl was first awake of all the tribesmen and he looked out into a cold and pallid grayness. He saw trees. One side of the cluster was brightly lighted, the other side was dark. He heard tiny singing noises of the creatures of this place. Presently he crawled out of the cave to scout for danger.