Recent discoveries at the GaJi10 site in the Koobi Fora formation near Lake Turkana in northern Kenya have led researchers to reconsider the size of Paranthropus boisei, a hominin species known for its strong jaws and robust build. The findings include 21 footprints, believed to belong to eight individuals, which suggest that some Paranthropus boisei individuals could have stood nearly 1.80 meters tall and weighed up to 75 kilograms. This challenges earlier estimates that placed their average height around 1.31 meters and weight at about 49 kilograms, which were based mainly on skull and jaw fossils. The footprints, preserved in ancient mud and dated to about 1.43 million years ago, were first noticed in 1978 but weren't analyzed in detail until recently. A team led by biologist Kevin Hatala from Chatham University, in collaboration with the Max Planck Institute for Evolutionary Anthropology, used the length, width, and depth of the footprints to estimate the individuals' height and weight. Their findings, published in the journal PNAS, suggest that these individuals were as large as Homo erectus, another hominin species that lived in the same region around the same time. The group of eight individuals appears to consist mainly of adult males, with no clear signs of females or children. This has led to speculation among researchers that the group might have been similar to male groups seen in modern primates, such as patrolling hunters or young males not yet involved in reproduction. However, the study's authors note that the footprints represent only a single moment in time and do not provide conclusive evidence about the group's behavior or social structure. Determining which hominin species left the footprints remains a point of debate. While the shape of the footprints aligns more closely with Paranthropus boisei than Homo erectus, the lack of associated bones means the identification is based solely on the footprint's morphology. Some scientists argue that the measurements could also fit Homo erectus, and the study authors agree that the attribution to a single species is not yet certain. This method of identifying hominin species through footprints is not new to the team, who previously used it to show that Homo erectus and Paranthropus boisei could have coexisted in the same area within a few days of each other. However, the technique remains controversial, as it relies on statistical comparisons of shape and movement patterns rather than direct genetic or anatomical evidence. The Lake Turkana region has yielded numerous hominin footprints across multiple sites, and the GaJi10 site is just one of many that may help reshape our understanding of early human relatives.