What was the first thing in the world to communicate?

The first forms of communication in the world are believed to be non-verbal cues, such as gestures and facial expressions, used by early humans. Over time, these evolved into more complex forms, including spoken language. Additionally, some scientists suggest that animals, like certain primates and birds, also exhibited early communication methods through sounds and body language. Ultimately, the exact "first" form of communication remains speculative and is a subject of ongoing research.