How did laughter developed in primates?

Laughter in primates is believed to have evolved as a social bonding mechanism, facilitating group cohesion and communication. Early forms of laughter likely emerged from vocalizations associated with play and social interactions, helping to signal non-aggression and promote cooperative behavior. This evolutionary trait may have provided advantages in forming alliances and reducing tension within groups, ultimately enhancing survival and reproductive success. Over time, these vocalizations became more refined, leading to the complex expressions of laughter observed in modern primates and humans.