"It is interesting to note that humans, uniquely among the primates so far considered, appear to have stomach pH values more akin to those of carrion feeders th

"It is interesting to note that humans, uniquely among the primates so far considered, appear to have stomach pH values more akin to those of carrion feeders than to those of most carnivores and omnivores. In the absence of good data on the pH of other hominoids, it is difficult to predict when such an acidic environment evolved. Baboons (_Papio_ spp) have been argued to exhibit the most human–like of feeding and foraging strategies in terms of eclectic omnivory, but their stomachs – while considered generally acidic (pH = 3.7) – do not exhibit the extremely low pH seen in modern humans (pH = 1.5). One explanation for such acidity may be that carrion feeding was more important in humans (and more generally hominin) evolution than currently considered to be the case [...]" - ["The Evolution of Stomach Acidity and Its Relevance to the Human Microbiome" (2015)](https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0134116 https://journals.plos.org/plosone/article?id=10.1371/journal...)