Imagine walking along a beach, not just any beach, but one that existed over 66 million years ago, teeming with dinosaurs. That’s exactly what scientists have uncovered in Bolivia—a staggering 18,000 dinosaur tracks, setting a new world record. But here’s where it gets even more fascinating: these aren’t just ordinary footprints. They’re a treasure trove of clues about how dinosaurs lived, moved, and even swam. And this is the part most people miss—some of these tracks are so small, they might have been left by baby dinosaurs or tiny species we rarely hear about.
In a groundbreaking study published in PLOS One, researchers revealed that the Carreras Pampa tracksite in Bolivia’s Torotoro National Park is a prehistoric goldmine. Spanning over 80,570 square feet, this ancient coastline has preserved 16,600 theropod footprints and 1,378 swim tracks. Theropods, the bipedal, three-toed dinosaurs that dominated the late Cretaceous period, were clearly the stars of this prehistoric highway. But what’s truly remarkable is the diversity of behaviors captured here—walking, running, swimming, and even tail-dragging. It’s like a dinosaur reality show frozen in time.
The team, led by McLarty, meticulously cleared debris and sediment to uncover these tracks, some as small as 4 inches and others as large as 12 inches. The smallest footprints have sparked a debate: were they made by juvenile dinosaurs or tiny species like Coelophysis? Meanwhile, the larger tracks might belong to mid-sized predators like Dilophosaurus or Allosaurus, though they’re still dwarfed by the 16-inch footprints left by giants like T. rex.
But here’s the controversial part: the swim tracks. Unlike other sites, Carreras Pampa preserves alternating left and right tracks, suggesting these dinosaurs weren’t just paddling—they were swimming with purpose. The grooves, shaped like commas or straight lines, were created as theropods scratched the sediment with their middle toe, while smaller grooves nearby indicate the movement of their other toes. Could this mean dinosaurs were better swimmers than we thought?
The parallel orientation of some trackways also hints that dinosaurs traveled in groups, raising questions about their social behavior. Bolivia, already a hotspot for dinosaur tracks, now boasts two of the world’s most impressive sites. While the Cal Orck’o tracksite is a vertical wall of tracks in an active quarry, Carreras Pampa spreads across a wider, more accessible area, making it a unique window into the past.
So, here’s the question for you: Do these discoveries challenge our understanding of dinosaur behavior, or are we just scratching the surface of what these ancient creatures were capable of? Let us know in the comments—we’d love to hear your thoughts!
