 For example, "L. reuteri" was discovered to be present naturally in the intestines of healthy sheep, chickens, pigs and rodents.Furthermore, a study searching for 18 major species in the gut microbiota, including "L. acidophilus", in a variety of animals found that "L. reuteri" was the only species to constitute a "major component" of the "Lactobacillus" species present in the gut of each of the tested host animals.It is one of the most ubiquitous members of the mammalian gut microbiota.