The crawler was even bigger than he'd thought. Standing within ten feet of it, he felt tiny and weak, a toy before this massive brute. Like ancient Earth dinosaurs, the crawlers kept growing as long as they lived. Tiny as the palm of a man's hand, foot-high creatures like those Nolan had kicked out of his way an hour before or monstrosities like the one before him--all three types existed side by side. Only seldom did they grow as great as this. Invulnerable though they were, they perished of starvation, when their bulk grew too much for their thousands of tiny legs to carry. Out of the ebon hulk of the thing came poking a minute head, goggle-eyed, with a luminous halo of green tendrils surrounding it. It blinked weakly at Nolan. He waited patiently. If the thing was convinced he was harmless. It was. Recovering from the shock of the skid's arrival it began to prepare for motion again. The head poked out toward the skid on a long, scrawny neck, examined it minutely. The big carapace shivered and rose slightly off the ground as the multitude of tiny legs took up the task of carrying it forward. Nolan stood motionless. The creature moved ponderously toward him, ignoring him. In the dull mind of the creature an object as tiny as a man was nothing. Even the skid was merely another sort of boulder, against which it could lean, send it hurtling over to destruction, out of its way. It moved forward till the hard horn almost touched him. Then Nolan leaped. This was the moment of decision. He circled the long neck with one lashing arm, clamped on it all the pressure he could bring to bear. It was the one sensitive spot the creature had--and protected, normally, by armor battleship-thick. Nolan strained the muscles of his arm, cursing the cushion of air inside his suit that made a pillow for the beast. The slippery flesh coiled and writhed in his grip; the beast exhaled a great, whistling screech of agony and the snakelike neck curved around. The popeyed head darted in at him, tiny mouth distended to show raw, red flesh inside. It battered ineffectually against the heavy plastic faceplate of his suit. The crawler vented its whistling sigh again and staggered drunkenly away. Away from the remorseless pressure on its sore spot, away from the agonizing weight of him. Its tiny legs carried it rocking sidewise. Then abruptly they tried to halt it, gave sharp warning to the tiny brain. It was too late. The scrambling legs flailed for a foothold and found vacuum. Nolan gave a final heave, felt the thing slide away from him, leaped back. Just in time. He himself was teetering on the brink of the chasm as the crawler, tiny head darting frantically, soundlessly around, slid over and disappeared. He didn't look down. The clattering and crashing vibrations from below told what happened. He turned, shook himself and headed for the skid. The girl was waiting for him. Nolan was mildly surprised. She looked at him curiously as he entered.