Two days before an earthquake struck Helice, Greece, in 373 B.C., the snakes, weasels, and worms deserted the city. Minutes before the Naples quake of 1805, oxen, sheep, dogs, and geese cried out in unison. A herd of horses tore loose and ran off in panic just prior to the San Francisco earthquake of 1906. Helmut Tributsch thinks that these accounts are more than mere superstition and old wives' tales. In this book, he presents the first plausible explanation of why animals behave in unusual ways prior to the onset of an earthquake.