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

Is your belly button basically a tiny armpit? What's actually in belly button lint? How does it even get there? Do you need to worry about it? Glad you asked, because there’s a remarkable amount of ...

Scientists had long speculated that egg-laying dinosaurs would have an umbilical scar, but this study is the first to find evidence of one. (Pictured: artist representation of a Psittacosaurus and its ...