This research article investigates territorial behavior in neonate warty birch caterpillars, specifically their defense of birch leaf tips. The study demonstrates that these tiny caterpillars establish small, exclusive areas at the leaf tip, using complex vibratory signals to advertise their presence and deter competitors. When another caterpillar intrudes, the resident significantly increases its signaling rate, and these encounters primarily involve vibratory communication rather than physical aggression. The findings suggest that leaf tips might offer advantages beyond just food, such as facilitating escape from predators, and highlight the understudied role of vibrational signaling in insect territoriality.