Firmicutes:Bacteroidetes ratio in fecal samples upon sacrifice (left). Wild High and Wild Low groups have a high relative abundance of Firmicutes and no Bacteroidetes. WH and WL thus had a significantly higher F:B ratio than CH and CL (p < 0.0001, Wilcox). Akkermansia:Clostridium ratio (right). Captive High and Captive Low groups have a high relative abundance of Akkermansia and little Clostridium. CH and CL groups thus had a significantly higher A:C ratio than WH and WL (p < 0.0001, Wilcox).