In recent decades, researchers have found that most mammals' guts are surprisingly complex environments - home to a variety of microbial ecosystems that can profoundly affect an animal's well-being. Scientists have now learned that the bear appears to be an exception, with its gut playing host to a microbial population that varies little across the intestinal tract.
https://www.sciencedaily.com/releases/2020/11/201130131446.htm