||Human Homo sapiens
||Adrian Lee, 1985, Neglected Niches: The Microbial Ecology of the Gastrointestinal Tract, Advances in Microbial Ecology, Volume 8 of the series Advances in Microbial Ecology pp 115-162 p.115
||Stephen AM, Cummings JH. The microbial contribution to human faecal mass. J Med Microbiol. 1980 Feb13(1):45-56. DOI: 10.1099/00222615-13-1-45PubMed ID7359576
||Abstract: "Every day we excrete 100–200 g of feces. Given that 75% of the wet weight is composed of bacteria (primary source) and that each gram contains 1 × 10^11 organisms belonging to up to 400 different species (Moore and Holdeman, 1974), it is clear that we are the outer casing of possibly one of the most highly evolved and complex microbial ecosystems of them all."