Network analysis of the family Lachnospiraceae in fecal communities of animals, humans, and sewage. Large dots represent individual samples, small dots represent operational taxonomic units (OTUs). Lines connect samples and OTUs to show connections among different individuals from the same and from different host species. Sewage samples from Spain, Brazil, Malawi, and the USA are indicated by distinct shades of green. Clear trends within host species are present, as well as OTUs that are shared among hosts or associated with an individual sample.