Dog vs. Cat
Dog and Cat gaze at each other.
Ants are leaving a pheromone trail leading to food.
Lion is gazing out looking or giving some type of message.
Most territorial animals are protecting there nest, den or even mating sites, mostly to defend this territory for resources. Usually this animals use vocal, visual or leave scents to mark their territory. If necessary to protect territory with their life, these organisms will, even though this doesn't happen often.