Gut Microbes' Ancient History (IMAGE) University of Texas at Austin Caption An artist's rendition of bacteria that live in the gut of people and their closest relatives. A new study finds that these microbes have lived -- and evolved -- with us since before we were human. Credit The University of Texas at Austin. Illustration by Jenna Luecke. Usage Restrictions Please include credit License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.