Most microbes in the digestive tract communities vary widely in relative abundance among body habitats and individuals. Genera with the lowest (top) to highest (bottom) variability among samples spanning all ten body sites, with coefficients of variation reported numerically (right column) and relative abundance colored on a log scale. The scale bar shows the color-coding of the average relative abundance expressed as percentage, from low (black) to high (red). All genera present >0.001% in at least half of the samples are reported. Prevotella, Veillonella, and Streptococcus are least variable across both body sites and individuals.