Which pheromone warns animals of possible predators?

Alarm pheromones play a critical role in the survival of many animal species by signaling the presence of potential threats or predators. When an animal senses danger, it can release these specific chemical signals into the environment. Other members of the same species, upon detecting these alarm pheromones, may exhibit fear or flight responses, thereby increasing their chances of survival by either fleeing from the area or taking other defensive actions.

Territorial pheromones are used to mark boundaries and communicate ownership of a territory, while sex pheromones are involved in attraction and mating behaviors. Amino acid hormones, on the other hand, are not pheromones; they are involved in various physiological processes but do not function in the context of predator warning. The distinct role of alarm pheromones in alerting others to danger underscores their importance in the communication systems of many animal species.