The Japanese pavement ant Tetramorium tsushimae has mass-recruitment system, and captures both corpses and living small animals. The living animals usually keep moving to escape from the ant attacks even after several scouter ants have returned to their nest for recruiting nestmates. There the trail pheromone deposited by the scouters might not lead the recruited ants precisely to the preys, so that the scouters might infrom unstabilities of the prey’s position to adjust the searching behavior of the recruited ants. We tested this hypothesis through field and lab tests by providing dead or living preys. When scouters had found dead preys, most of the recruited workers located within a distance of 1 cm from the prey in both tests. When scouters had found living preys, however, more recruited workers kept plowling around 3 cm away from the prey while they never touched it. These suggest that the scouters would give an information vital condition of the preys to the nestmates for adjusting their searching behavior at reaching to the foraging area. By letting know the difficulities to locate to the living preys, scouters would change foraging behavior of the recruited workers.