What type of communication occurs when a monkey gives special loud cry if it sees bird prey that might threaten the troop?

The type of communication that occurs when a monkey gives a special loud cry if it sees bird prey that might threaten the troop is called an alarm call. Alarm calls are vocalizations that are produced by animals to warn others of potential danger. They are often used to alert group members to the presence of predators, but can also be used to warn of other threats, such as food shortages or natural disasters. Alarm calls are typically loud, high-pitched, and distinctive, so that they can be easily heard and understood by other members of the group.