In seconds, the app suggests what type of dinosaur likely made it, with accuracy that rivals expert paleontologists in most tests. So what is the app actually looking at when it studies a three\u2011toed print in stone?<\/p>\n\n\n\n
How DinoTracker reads stone footprints<\/h2>\n\n\n\n
Behind the simple interface is an unsupervised neural network that was trained on 1,974 dinosaur and bird footprints, spanning more than 200 million years of evolution<\/a>. <\/p>\n\n\n\n Instead of being told in advance which tracks belong to which group, the network was left to sort the shapes on its own and find the patterns that best separate them.<\/p>\n\n\n\n The model learned eight key ways that footprints differ. Among them are how widely the toes spread, how the toes attach to the rest of the foot, where the heel sits, how much of the foot actually touched the ground and how the weight was distributed from left to right. <\/p>\n\n\n\n In trials, its classifications matched human expert judgments roughly 80 to 93 percent of the time, depending on the kind of track.<\/p>\n\n\n\n Physicist Gregor Hartmann, who led the study, describes the method as an objective way to recognize subtle variation in footprints that people tend to miss. He notes that it reduces the risk that long\u2011standing assumptions will simply be baked into new digital tools.<\/p>\n\n\n\n Once the network had mapped this footprint \u201clandscape,\u201d the team added labels based on previous expert work, including tracks from meat\u2011eating theropods, plant\u2011eating ornithopods, large quadrupeds and both fossil and modern birds. Then they fed in some of the most controversial prints in dinosaur research<\/a>.<\/p>\n\n\n\n Several tiny three\u2011toed tracks from the Late Triassic and Early Jurassic, including a set from what is now South Africa, had long looked uncannily bird\u2011like. DinoTracker placed most of them squarely among bird footprints, not with non\u2011avian theropods.<\/p>\n\n\n\n The tracks are around 210 million years old, roughly 60 million years older than the earliest known bird skeletons<\/a>.<\/p>\n\n\n\n Does that mean real birds were already walking around that early? Researchers are cautious. The prints might represent true early birds whose bones have not yet been found, but they could also come from small dinosaurs that just happened to have very bird\u2011like feet or that made bird\u2011like impressions in soft, wet sediment. <\/p>\n\n\n\n As one of the study\u2019s senior authors, paleontologist Steve Brusatte, puts it, the resemblance is so strong that scientists now have to take this possibility seriously and look for an explanation that fits both bones and tracks.<\/p>\n\n\n\n The app also revisited puzzling Middle Jurassic footprints from the shores of a long\u2011vanished lagoon on the Isle of Skye.<\/p>\n\n\n\n Many of those prints cluster with early relatives of duck\u2011billed dinosaurs, suggesting some of the oldest known members of that group were already roaming what is now Scotland, even though a few tracks still look closer to classic theropods.<\/p>\n\n\n\n At first glance, all this may sound like a very specialized debate. Yet dinosaur footprints are not just curiosities pressed into slabs in a museum hallway. They form in real environments such as riverbanks, floodplains and tidal flats, and they often preserve how animals moved, which paths they followed and which habitats they preferred. <\/p>\n\n\n\n That makes them powerful clues to the structure of ancient ecosystems and to how life responded when climate and sea level shifted in the deep past.<\/p>\n\n\n\n By sorting thousands of tracks in a more consistent way, AI tools like DinoTracker can help scientists better map when different dinosaur groups appeared, where they lived and how communities changed across mass extinctions<\/a>. <\/p>\n\n\n\n Those long\u2011term patterns matter when we ask how today\u2019s species might react to rapid warming or habitat loss. The rock record becomes a kind of stress test for planetary change.<\/p>\n\n\n\n The team is clear that DinoTracker does not replace human fieldwork. The shape of a footprint depends on what the animal was doing, how wet the ground was and how much the print has been eroded or distorted during fossilization. <\/p>\n\n\n\n The app focuses on shape alone, so researchers still need to verify the age and geology of each site before any bold claim about bird origins or dinosaur behavior can stand.<\/p>\n\n\n\n The good news is that the software is free and meant for both professionals and curious members of the public. A paleontologist working in a remote desert, a student on a class trip or a hiker who stumbles across a suspicious three\u2011toed impression can all use the same tool to get a first, standardized comparison with known tracks. <\/p>\n\n\n\n That first pass may be wrong in some cases, but it gives experts a common starting point instead of a stack of competing gut feelings.<\/p>\n\n\n\n In the end, DinoTracker acts less like an oracle and more like an extra colleague at the table, one that sees patterns in stone that human eyes easily overlook. <\/p>\n\n\n\n The study was published in Proceedings of the National Academy of Sciences<\/em><\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":" Dinosaur tracks have always been a bit of a riddle. 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