Guppy
Guppies have a tongue, teeth, a pharynx, gill slits, an esophagus, a stomach, intestines, and an anal opening. Digestion begins in the mouth. First, the food is mashed up into small pieces by the teeth. Then, the food travels down the pharynx. On either side of the pharynx, there are gill slits. Gill slits allow water to pass into the chambers, which helps break down the food even more. The food must pass through the esophagus in order to enter the stomach.