Foot-and-mouth disease is a form of flu, treatable by proper veterinary care, preventable by vaccination, lethal neither to humans nor to animals. These animals, millions of them not even infected, were all killed only because their market value had been diminished and because trade policies required it-because, in short, under the circumstances it was the quick and convenient thing to do. By the one measure we now apply to these creatures, they had all become worthless. For them, the difference between what happened and what awaited them anyway was one of timing. And for us the difference was visibility. This time, we had to watch.