Paleontologists have discovered the oldest belly button known to science on a 125 million-year-old fossil of a dinosaur in the genus Psittacosaurus.

As reported by Live Science, the Psittacosaurus lived during the Cretaceous period, which was between 145 million to 66 million years ago, and the scientists discovered this belly button after they exposed the fossil to a concentrated beam of laser light.

"Using LSF imaging, we identified distinctive scales that surrounded a long umbilical scar in the Psittacosaurus specimen, similar to [scars in] certain living lizards and crocodiles," paleontologist Michael Pittman, an assistant professor in the School of Life Sciences at the Chinese University of Hong Kong, said in the statement.

This specimen is the first dinosaur fossil to preserve a belly button, which is due to its exceptional state of preservation."?