Overhead, Semper fluttered and flew in giant circles and spirals, never going very far away. Huyghens referred constantly to the screen which showed what the air-borne camera saw. The image tilted and circled and banked and swayed. It was by no means the best air-reconnaissance that could be imagined, but it was the best that would work. Presently Huyghens said: "We swing to the right, here. The going's bad straight ahead, and it looks like a pack of sphexes has killed and is feeding." Bordman said: "It's against reason for carnivores to be as thick as you say! There has to be a certain amount of other animal life for every meat-eating beast. Too many of them would eat all the game and starve." "They're gone all winter," explained Huyghens, "which around here isn't as severe as you might think. And a good many animals seem to breed just after the sphexes go south. Also, the sphexes aren't around all the warm weather. There's a sort of peak, and then for a matter of weeks you won't see one of them, and suddenly the jungle swarms with them again. Then, presently, they head south. Apparently they're migratory in some fashion, but nobody knows." He said drily: "There haven't been many naturalists around on this planet. The animal life's inimical." Bordman fretted. He was accustomed to arrival at a partly or completely finished colonial set-up, and to pass upon the completion or non-completion of the installation as designed. Now he was in an intolerably hostile environment, depending upon an illegal colonist for his life, engaged upon a demoralizingly indefinite enterprise--because the mechanical spark-signal could be working long after its constructors were dead--and his ideas about a number of matters were shaken. He was alive, for example, because of three giant Kodiak bears and a bald eagle. He and Huyghens could have been surrounded by ten thousand robots, and they'd have been killed. Sphexes and robots would have ignored each other, and sphexes would have made straight for the men, who'd have had less than four seconds in which to discover for themselves that they were attacked, prepare to defend themselves, and kill the eight sphexes. Bordman's convictions as a civilized man were shaken. Robots were marvelous contrivances for doing the expected, accomplishing the planned, coping with the predicted. But they also had defects. Robots could only follow instructions. If this thing happens, do this, if that thing happens, do that. But before something else, neither this or that, robots were helpless. So a robot civilization worked only in an environment where nothing unanticipated ever turned up, and human supervisors never demanded anything unexpected. Bordman was appalled.