Day of the Hunters
When Time Travel Rewrites Extinction

It starts innocently enough: three friends arguing over the atomic age, the future, and wild scientific rumors about time travel. Then a half-drunk stranger interrupts—an ex-scientist, perhaps, or a lunatic—and tells them he’s already been to the Mesozoic Era. What follows is a revelation so unexpected that it silences their laughter and echoes long after the bar lights fade.The “Professor” insists he saw small, intelligent lizards equipped with energy weapons, hunting dinosaurs for amusement until they exterminated their entire species—then themselves. The others scoff, but Isaac Asimov twists the knife with a question that lands closer to home: what happens when the hunters run out of prey? Humanity’s destructive curiosity, its genius for invention and appetite for dominance, stand mirrored in those vanished reptilian conquerors.First appearing in Future combined with Science Fiction Stories (1950), “Day of the Hunters” packs big ideas into a few pages—time travel, extinction, and the repeating cycles of intelligence and self-destruction. It’s classic Asimov: clever, efficient, unsettling, and steeped in his fascination with logic pushed to its fatal conclusion. Beneath the easy banter of barroom talk lies an eerie moral about civilization’s end, told with Asimov’s unmistakable wit and precision.