Homo erectus likely communicated through a combination of vocalizations and gestures. While they did not have a complex language like modern humans, evidence suggests that they had the capacity for more sophisticated communication than their predecessors.
Archaeological findings indicate that Homo erectus used tools, which implies they had the need to convey ideas and instructions. Gestures probably played a significant role in their interactions as they worked together to hunt and gather. Their ability to work in groups would have required some form of coordination and understanding among individuals.
Additionally, the structure of their vocal tract points to the potential for a range of sounds, suggesting they could produce different types of vocalizations. This means that while they may not have had a fully developed language, their communication could have included sounds that conveyed various meanings.
In summary, Homo erectus likely used a rudimentary form of communication that relied on both vocal sounds and physical gestures, enabling them to cooperate and share information in their daily lives.