The mouth and esophagus are usually lined with cilia to propel food particles backward into the stomach. Salamander stomachs are difficult to distinguish from the rest of the gut, being a straight tube. Frogs on the other hand, have a tapering effect, larger at the end closest to the heart narrowing to a short pyloric section. Unlike fish, all amphibians have digestive glands lining the gut. Caecilians have no separate large and small intestine, just intestine with very little coiling.
Salamanders have distinct large and small intestine with more evident coiling.
Frogs have easily identifiable large and small intestines and more marked coiling. The intestine opens into the cloaca, a common chamber of the urinary, digestive, and reproductive systems. During embryonic development several paired pouches form in the wall of the pharynx. Most amphibians form 3 pairs that open through to the outside and form gill slits. The gill slits are filamentous and covered with ciliated epithelium.