{"id":789747,"date":"2026-07-28T17:54:12","date_gmt":"2026-07-28T17:54:12","guid":{"rendered":"https:\/\/www.newsbeep.com\/us\/789747\/"},"modified":"2026-07-28T17:54:12","modified_gmt":"2026-07-28T17:54:12","slug":"scientists-unearth-new-clues-about-nutcracker-man","status":"publish","type":"post","link":"https:\/\/www.newsbeep.com\/us\/789747\/","title":{"rendered":"Scientists unearth new clues about \u2018Nutcracker Man\u2019"},"content":{"rendered":"

\n Scientists have revised the longstanding picture of \u201cNutcracker Man\u201d \u2014 an extinct hominin<\/a>, or human relative, nicknamed for its large teeth and powerful jaw muscles \u2014 thanks to fresh analysis of fossil footprints from a site in Kenya.\n <\/p>\n

\n Nutcracker Man, whose species is scientifically known as Paranthropus boisei, lived in eastern Africa from about 2.3 million to 1.2 million years ago, and this new evidence suggests that P. boisei was taller and heavier and had more complex social relationships than once thought.\n <\/p>\n

\n Prior estimates based on P. boisei fossil evidence hinted that males stood about 4.2 feet (131 centimeters) tall and weighed approximately 108 pounds (49 kilograms) on average. Updated calculations based on the length and width of 21 newly identified P. boisei footprints suggest that Nutcracker Man\u2019s size was more humanlike, standing up to 6 feet (1.8 meters) tall and weighing as much as 165 pounds (75 kilograms).\n <\/p>\n

\n Patterns in the footprints further indicate that the tracks belonged to eight P. boisei individuals who crossed through the site \u2014 East Turkana\u2019s Koobi Fora Formation \u2014 at the same time, traveling as a group. These preserved prints provide clues about the complexity of their social structure in their lakeside habitat, researchers reported Monday in the journal PNAS<\/a>.\n <\/p>\n

\n \u201cThe site captures an amazing snapshot of hominin anatomy, locomotion, behavior, and environments,\u201d said lead study author Kevin Hatala, an associate professor of biology at Chatham University in Pittsburgh and an associate researcher at the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany.\n <\/p>\n

\n \u201cEach set of footprints like this one provides a window to a moment in time when we can directly observe how hominins were living, and engaging with their environments,\u201d Hatala told CNN in an email. \u201cWe think that the footprints may capture a group of adult males moving together along the lakeshore,\u201d he said, adding that the threat of dangerous animals such as hippos could explain why the group included only adult males.\n <\/p>\n

\n \u201cFootprints are important fossils because they provide us with both anatomical and behavioral information,\u201d said Patricia Kramer, a professor in the department of anthropology at the University of Washington in Seattle and an affiliate curator of archaeology at the Burke Museum. Kramer has previously studied these trackways but was not involved in the new research.\n <\/p>\n

\n \u201cI am excited that the authors have provided additional information and analysis about the trackways at Koobi Fora,\u201d she told CNN in an email.\n <\/p>\n

\n The tracks, which are about 1.4 million years old, are well-defined with depths reaching 0.4 inches (12 centimeters), and were probably pressed into mud in shallow lake water, the authors reported. Seven tracks were uncovered in 1978 through fieldwork led by senior study author Anna Katherine \u201cKay\u201d Behrensmeyer, a senior research geologist and curator of vertebrate paleontology at the Smithsonian\u2019s National Museum of Natural History in Washington, DC. Excavations in 2016 and 2023 later revealed 14 more hominin footprints, along with tracks left by animals such as antelope and hippos.\n <\/p>\n

\"The<\/p>\n

\n P. boisei wasn\u2019t the only archaic human relative living near Lake Turkana. For hundreds of thousands of years, P. boisei coexisted alongside Homo erectus. Another study<\/a> from 2024 led by Hatala reported the discovery of fossil footprints in Kenya\u2019s Turkana Basin made no more than a few days apart by two different hominin species, and the researchers hypothesized that the prints belonged to H. erectus and P. boisei.\n <\/p>\n

\n \u201cWe can\u2019t say how the two different hominins interacted on the mudflats, but we know they were both here at this time,\u201d Behrensmeyer said in a statement.\n <\/p>\n

\n Homo erectus was the earliest relative of Homo sapiens to share similar body proportions with modern humans, demonstrating that the species had adapted to a life of upright walking. By comparison, P. boisei, a more distant cousin of modern humans, had physical features that more closely aligned with those of our tree-dwelling primate ancestors.\n <\/p>\n

\n Impressions made by P. boisei feet resemble footprints made by H. erectus and modern humans. However, some key differences set P. boisei tracks apart, Hatala said.\n <\/p>\n

\n In prior research into hominin footprints dating to the early part of the Pleistocene (2.6 million to 11,700 years ago) \u2014 when P. boisei was around but H. erectus was not \u2014 researchers found that the prints had flatter arches than those made by H. erectus and modern humans. While that doesn\u2019t necessarily mean those older hominins had flatter feet, \u201cit at least tells us they moved their feet against the ground in a different way,\u201d Hatala explained.\n <\/p>\n

\n \u201cWe\u2019ve also found that those same footprints tend to have a big toe that is more angled away from the other toes,\u201d he added. \u201cBoth of these features differ from what we usually see in modern humans, and that led us to hypothesize that footprints with that shape were more likely made by P. boisei.\u201d\n <\/p>\n

\n Footprint impressions can vary greatly depending on the type of ground and how wet or sticky it is, so the researchers controlled for those variations, Hatala said.\n <\/p>\n

\n \u201cIn our experiments we have sampled an extensive range of substrate variation, and we have conducted multiple experiments using a rehydrated version of the same kind of mud in which these Early Pleistocene footprints are preserved.\u201d\n <\/p>\n

\n Further analysis of P. boisei\u2019s footprints could reveal additional clues about its habits, though it will be challenging to interpret how the species\u2019 toe angle and arch height affected its lifestyle, Kramer said.\n <\/p>\n

\n \u201cI am cautious about attributing importance to particular morphology because there are many ways to move effectively in the environment as a biped,\u201d she said. \u201cNonetheless, we desperately need the kind of in-depth, thorough analyses that this new work exemplifies.\u201d\n <\/p>\n

\n Scientists discovered the first P. boisei fossils in the 1950s. However, estimating the size of this human relative has been challenging because there have been few fossils other than skulls that could unequivocally be attributed to the genus, according to Hatala. Larger bones from this time and place were typically thought to belong to H. erectus, while smaller bones were associated with Paranthropus.\n <\/p>\n

\n \u201cBut maybe these species were much closer in body size than previously thought,\u201d Hatala said.\n <\/p>\n

\n Unlike fossilized anatomical remains such as bones and teeth, fossil footprints are a snapshot in time that capture an impression of ancient hominins when they were still alive. Those glimpses do more than preserve the past; they also highlight the connection between modern humans and our long-extinct relatives, Behrensmeyer said.\n <\/p>\n

\n \u201cThey allow people to relate to these fossils much more easily than an isolated piece of bone or jaw,\u201d she said.\n <\/p>\n

\n This perspective brings the prehistoric world of our extinct relatives into clearer focus, Kramer added. While P. boisei and H. erectus may not have looked much like modern humans, Homo sapiens followed in their footsteps and walked the same African landscape about half-a-million years later.\n <\/p>\n

\n \u201cIt is a story of a world populated by creatures so much like us but so different at the same time,\u201d Kramer said.\n <\/p>\n

\n Mindy Weisberger is a science writer and media producer whose work has appeared in Live Science, Scientific American and How It Works magazine. She is the author of \u201cRise of the Zombie Bugs<\/a>: The Surprising Science of Parasitic Mind-Control\u201d (Hopkins Press).\n<\/p>\n

\n Sign up for CNN\u2019s Wonder Theory science newsletter<\/a>. Explore the universe with news on fascinating discoveries, scientific advancements and more.<\/p>\n","protected":false},"excerpt":{"rendered":"Scientists have revised the longstanding picture of \u201cNutcracker Man\u201d \u2014 an extinct hominin, or human relative, nicknamed for…\n","protected":false},"author":2,"featured_media":789748,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[32],"tags":[79],"class_list":["post-789747","post","type-post","status-publish","format-standard","has-post-thumbnail","category-science","tag-science"],"_links":{"self":[{"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/posts\/789747","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/comments?post=789747"}],"version-history":[{"count":0,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/posts\/789747\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/media\/789748"}],"wp:attachment":[{"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/media?parent=789747"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/categories?post=789747"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/tags?post=789747"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}