- Herbivores (eat plants), carnivores (eat animals) and omnivores (eat both plants and animals) have differences in their digestive systems depending on what they eat.
- Humans are omnivores, so they have a digestives system in which all organs, except the appendix, are important for digestion.
- In horses and rabbits the appendix is very important for digestion. In sheep and cattle, the stomach, especially the rumen section, is very important.