Roaches don’t like light, as almost any apartment dweller can tell you. So what would drive this tough critter—supposedly able to survive nuclear war—from shadowy safety into the dangers of daylight? And how can anyone explain why some roaches seem hyperactive, darting around conspicuously? It’s almost as if the cockroach is asking to be eaten. AVERAGE SIZE: 1 to 2 inches (28 to 45 millimeters).