“It was not that intelligent life was rare, it seemed, but that intelligent life was very, very prone to becoming extinct. Almost as if something was deliberately wiping it out. The wolves were the missing element in the puzzle, the agency responsible for the extinctions. Implacable, infinitely patient machines, they homed in on the signs of intelligence and enacted a terrible, crushing penalty. Hence, a lonely, silent galaxy, patrolled only by watchful machine sentries.”
