The way organisms communicate is their form of behavioral that sends signals to other organisms. Gestures, facial expression, gaze, or chemical signal is some other ways organisms communicate. Many animals (ants, deer, wolves) use pheromones to make a path to send others messages to tell them where to find food, or tell them how to get home. Pheromones also tells there a alarm calls, mate attraction, and to distinguish between areas. Bees has a dance to tell other bees which direction to find food.
The tiger is communicating with the lion saying its his land.
The wolf is trying to tell his pack mates that there is food some where.
The monkey is trying to communicate with another monkey by using with his facial expressions.
In a territorial area, animals defend animals that contain a nest, den, or mating site. Species defend their territory to get food for their families. Usually most defense rarely creates a fight. Sometimes animals will have a display to show its their area. It can be visual, vocally, or some animals urinate to show its their land. Some animals will fight till death to prove its their area.