An extensive study by Radboud University Nijmegen on excrement and rumen fluids in plant-eating mammals from all over the whole world shows that the ciliates in their guts have evolved in parallel with them.
Fuente : http://www.alphagalileo.org/ViewItem.aspx?ItemId=1...
Fuente : http://www.alphagalileo.org/ViewItem.aspx?ItemId=1...