A crocodile relative that walked on two legs. That is what paleontologists have uncovered in southern Brazil. The creature, named Labrujasuchus expectatus, lived about 212 million years ago during the Triassic period. It stood on its hind legs and measured roughly the size of a modern dog.
A surprising discovery in Rio Grande do Sul
The fossils were found in the municipality of Agudo, in the state of Rio Grande do Sul, Brazil. Researchers from the Universidade Federal de Santa Maria and the Natural History Museum of Los Angeles County led the work. The site has produced other Triassic fossils before, but this one stood out. The bones included parts of the skull, spine, and hind limbs. They showed clear signs of a bipedal posture. That is unexpected because modern crocodiles and their close relatives are four-legged, low slung animals.
Why locals and scientists took notice
For people in the region, the discovery adds to a growing list of important fossils found in southern Brazil. The area is known for its Triassic rock formations. Local universities and museums have built a reputation around these finds. For paleontologists, Labrujasuchus expectatus fills a gap in the evolutionary story of pseudosuchians, the group that includes modern crocodiles and their extinct relatives. It suggests that some early members of this lineage experimented with walking on two legs long before dinosaurs became dominant.
The creature belonged to a subgroup called loricatans. Its name means "expected crocodile from Agudo." The researchers published their findings in the journal Acta Palaeontologica Polonica. They described the animal as a fast moving predator that likely hunted small prey in a dry, seasonal landscape.
What the bones tell us
The hind limb bones were long and sturdy, built for supporting the animal's full weight. The front limbs were shorter. This pattern matches other bipedal reptiles from the Triassic. The skull had a narrow snout and sharp teeth. The overall build suggests agility rather than brute strength. The discovery also raises new questions. If a crocodile relative could walk on two legs, how many other pseudosuchians might have done the same? The fossil record may hold more surprises.
This find does not rewrite the story of crocodile evolution on its own. But it adds a new chapter. It shows that the ancestors of today's crocodiles were more diverse in shape and behavior than previously understood. The fossils from Brazil continue to reshape what scientists think they know about life before the dinosaurs.
