It is ironic that as little as the Federal government knows about the effect of noise on animals, it knows more about porcine and bovine reactions to noise than human reactions. Since swine and cows cannot complain for themselves, the farmer, through his powerful lobbies and well-funded Department of Agriculture, does the complaining for them. And government listens. When farmers worried that jet noise troubled their swine, they had no difficulty getting the Federal government to provide the necessary research. Air Force researchers checked for stress and behavioral changes. They obtained electrocardiograms; they made films of behavioral changes during mating and suckling. But when it comes to jet-stressed human beings we do not perform physiological and behavioral studies; no, we stop at opinion surveys and personality profiles. Are we afraid of what we might find out about the impact ofjet noise on human beings living near airports?