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. This is the result of a five-year research project performed by evolution biologists, microbiologists and computer scientists at Radboud University Nijmegen and published this week in the European Journal of Protistology.
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Excrement collected worldwide shows co-evolution of herbivores and their gut microbes