AUTHOR=Gilbert Rosalind A. , Dagar Sumit S. , Kittelmann Sandra , Edwards Joan E. TITLE=Editorial: Advances in the Understanding of the Commensal Eukaryota and Viruses of the Herbivore Gut JOURNAL=Frontiers in Microbiology VOLUME=12 YEAR=2021 URL=https://www.frontiersin.org/journals/microbiology/articles/10.3389/fmicb.2021.619287 DOI=10.3389/fmicb.2021.619287 ISSN=1664-302X