Purussaurus neivensis Hunted Rhino-Sized Mammals in Ancient Colombia

Crocodiles command fear across modern waterways, but their ancient relatives operated on a vastly different scale. During the Miocene epoch, spanning from 23 million to 5.3 million years ago, South American wetlands were ruled by Purussaurus neivensis, an extinct caiman that attained lengths of 7 meters and weighed roughly 1,800 kilograms, matching the heft of an average modern car as detailed by ScienceAlert. First formally described in 1941 and named after the nearby Purus River, the massive reptile left behind fossilized evidence that researchers have used to reconstruct an extraordinary predatory ecosystem according to ScienceAlert.

Fossilized Bite Marks in La Venta Ungulates

Paleontologists analyzing four fossilized bones between 10.5 and 16 million years old from the La Venta region in Colombia’s Huila department discovered direct physical proof of predation reported by SCI and noted by Studyfinds.

These remains belong to three distinct species of large plant-eating ungulates: the rhinoceros-sized Pericotoxodon platignathus alongside elephant-like herbivores named Xenastrapotherium kraglievichi and Granastrapotherium snorki detailed by SCI. Researchers estimated that these prey animals weighed anywhere from 600 to 1,800 kilograms reported by SCI. The bones bore circular puncture wounds, bisected marks, and crushed areas consistent with a massive crocodylian attack according to SCI.

Bite Force Calculations and Predatory Tactics

To pin down the identity of the hunter, scientists compared the puncture dimensions against 22 isolated Purussaurus teeth reported by Studyfinds. The thick, cone-shaped front teeth of Purussaurus frequently exceeded 30 millimeters across at the base, providing a consistent match to the wounds according to Studyfinds.

“Our new study shows that [crocodilians] in particular were the region’s most important predators, especially when it came to hunting large prey.”

Dr. Oscar Wilson, postdoctoral researcher at the University of Helsinki, via SCI

Calculations indicate that some bite forces approached or exceeded 40,000 newtons per tooth, roughly double the strength generated by a modern saltwater crocodile noted by SCI and Studyfinds. Most of the damage concentrated around the heads and jaws of the victims, mirroring the ambush tactics used by modern Nile and saltwater crocodiles reported by SCI and Studyfinds.

Scavenging Evidence Involving Langstonia huilensis

The fossil record also preserves multi-stage feeding interactions. One astrapothere jawbone belonging to Xenastrapotherium exhibited two distinct sets of marks reported by SCI and Studyfinds. Deep punctures on the inner side matched a Purussaurus attack, while an oval depression on the outer side displayed ten thin, parallel scratches according to Studyfinds.

Researchers attributed the secondary set of marks to Langstonia huilensis, a land-dwelling crocodile relative equipped with blade-like, serrated teeth that reached roughly 4.2 meters in length and hunted or scavenged somewhat like a modern Komodo dragon noted by SCI and Studyfinds. This evidence suggests Purussaurus made the initial kill, after which smaller terrestrial predators fed upon the carcass and a smaller, land-dwelling crocodile relative scavenged the remains afterward.

Ecosystem Dynamics in Miocene South America

Before the Great American Biotic Interchange enabled animal migrations between North and South America, the continent lacked large mammalian carnivores such as lions, bears, or wolves reported by ScienceAlert and Studyfinds. Instead, ecological niches for top meat-eaters were filled by massive reptiles, flightless terror birds with deep beaks, and giant madtsoiid constrictor snakes detailed by ScienceAlert and Studyfinds.

Data published on August 16, 2026, in the Journal of Vertebrate Paleontology establishes that Purussaurus neivensis and other giant crocodylians served as essential regulators of large herbivore populations across Miocene wetland environments according to SCI.