Two weeks ago, we (finally) returned data to participants in the Belly Button Biodiversity project and unveiled some slick, new data visualizations to help participants and any one who’s curious explore the microbial jungle inside our navels.

If you browse the interactive pie charts, you’ll notice that a handful of bacteria are super-common. Some of these bacteria – like Corynebacterium and Staphylococcus — we know a lot about.

Other common belly button bacteria, however, remain understudied and, quite frankly, unknown. In this new chapter in the Invisible Life project, Rob Dunn sketches out the few things we do know about the common yet enigmatic Anaerococcus and Finegoldia.