Gallery: Bacteria in Your Belly Button

Navel Gazing

Unknown and mysterious species of microbe lurk in our belly buttons, the Bellybutton Biodiversity project is finding. Preliminary results from the project, based at North Carolina State University, show hundreds of new or little-known types of bacteria living in navels. Some of these miniscule creatures can grow into fuzzy colonies on petri dishes.

Sample No. 952

Bacteria grown from a sample collected from anonymous donor no. 952's belly button.

Sample No. 966

After the belly button bacteria are collected on a Q-tip. Researchers analyze their DNA to determine what species are present. They also grow those microbes that will cooperate in dishes like this one.

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Sample No. 976

No one knows what many of the bacteria found in bellybuttons eat and many species cannot be cultured in a laboratory. As a result, the microbes grown in dishes like this one do not represent all of a belly button's inhabitants

Sample No. 1123

From the first 92 samples, researches counted 1,400 species, but the actual count is probably much higher, they say.

Sample No. 1129

Of the 1,400 species, about 600 or so don't match up in obvious ways to known species, meaning they are either new to science or not well known, according to Rob Dunn, an associate professor in the North Carolina State University biology department, and the belly button principal investigator.

Sample No. 1130

So far, belly button investigators have found many, many species, but a substantial number of these are very common among the people who submit samples.

Sample No. 1135

The microbes living in our belly buttons and elsewhere on our skin play an important role in keeping us healthy, scientists are finding.

Sample No. 1155

The project has received more than 400 samples so far, and has been overwhelmed by potential microbe donors

Sample No. 1158

As the project continues, researchers believe they could find thousands of additional species inhabiting belly buttons.