In most animals, digestion occurs:

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Most animals have an extracellular digestive system that involves a cavity with a mouth and an anus or other opening. This allows for the ingestion of food, its breakdown by enzymes, and the absorption of nutrients across the lining of the cavity. Examples of animals with this type of digestive system include insects, birds, mammals, and reptiles. Extracellular digestion also occurs in some aquatic animals such as jellyfish and sea anemones, within a gastrovascular cavity. However, this is not the case for most animals. Intracellular digestion occurs in some animals such as sponges, through specialized cells called collar cells. Simple absorption occurs in some animals such as flatworms, where nutrients diffuse directly into the body tissues.

In Most Animals, Digestion Occurs