When a animal eats a plant where is starch broke down?

When an animal eats a plant, starch is primarily broken down in the digestive system, specifically in the mouth and the small intestine. In the mouth, salivary amylase begins the process of starch breakdown into simpler sugars. The majority of starch digestion occurs in the small intestine, where pancreatic amylase further breaks down the starch into maltose and other monosaccharides for absorption.