Newly discovered footprints in Kenya, dating back 1.43 million years, are offering unprecedented insights into the life of *Paranthropus boisei*, an extinct hominin species. Researchers identified 21 footprints made by eight individuals, suggesting adult males travelled together on muddy lakeshores. This discovery is significant as *Paranthropus boisei* is primarily known from skull and tooth fossils, leaving much of its post-cranial anatomy a mystery. The footprints reveal clues about the social dynamics of this species, indicating possible male-dominated groups separate from females and children. These findings, published in *Proceedings of the National Academy of Sciences*, complement earlier 2024 research showing *Paranthropus boisei* coexisted with *Homo erectus*. The footprints provide a “snapshot” into how these hominins moved, appeared, and interacted with their environment.