Rainbow trout are largely carnivorous, but show few anatomical specializations for capturing and digesting prey. Teeth are simple and small with no other elaboration of structures to capture, hold, or swallow prey. Salmonids swallow their food whole via a wide oesophagus into a Y-shaped stomach. Many pyloric caecae branch near the pyloric end of the midgut, their numbers often being of taxonomic importance among the various salmonid species. The pancreas is diffusely scattered in the fat and connective tissue around the pyloric caecae and is not readily visible. The gall bladder extends from the middle lobe of the liver and the bile duct can usually be traced from there to the upper midgut in larger specimens. The midgut merges into the hindgut without any particular demarcation.