Top Highlights
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Giant crocodylians may have ruled La Venta’s wetlands in Colombia about 12 million years ago, preying on enormous plant-eating mammals.
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Fossil bones bear deep punctures, crushing, and tooth grooves—damage researchers documented with 3D models and CT scans.
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The wounds best match Purussaurus neivensis, a caiman relative estimated to reach about 23 feet long, with bites powerful enough to crush fresh bone.
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Hunting is the leading explanation, but scavenging can’t be ruled out. The evidence comes from just four fossils, so more finds are needed to confirm how common these attacks were.
Wetland giants held the advantage
About 12 million years ago, rivers and wetlands in what is now Colombia supported huge plant-eating mammals and several kinds of predators. Mammalian hunters lived there, but they were relatively scarce. New evidence suggests giant crocodylians often filled the top-predator role.
Researchers examined four fossil bones from three large mammals. Deep punctures, crushed bone and tooth grooves point to bites from powerful jaws. The strongest match came from Purussaurus, a giant caiman relative that may have reached 23 feet long and weighed nearly 4,000 pounds.
Bite marks tell a story, with limits
The team used photographs, 3D models and a CT scan to compare the wounds with fossil teeth. Some bite-force estimates reached about 15,700 pounds-force. The marks suggest that Purussaurus fed on these mammals, perhaps by ambushing them near water.
Still, the evidence cannot show whether every attack ended in a kill. Crocodylians may also have scavenged some remains. And four fossils offer only a small sample of La Venta’s ancient ecosystem.
Better tools can sharpen the picture
Non-destructive scans and 3D models give researchers practical ways to study fragile fossils without cutting into them. Wider surveys could reveal how often crocodylians left such marks and whether other predators also fed on these animals.
For now, the fossils add a vivid detail to Earth’s deep past: wetlands once supported reptiles capable of tackling enormous prey. That knowledge does not change daily life, but it helps explain how ancient ecosystems worked—and broadens our view of the natural history that eventually shaped the world humans inherited.
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