The animal digestive system type that involves regurgitation and re-chewing of food is the **Ruminant** digestive system. Here's an explanation to help you understand why:
1. **Ruminants** such as cows, sheep, and deer have a unique digestive system that includes a specialized stomach with four compartments: the rumen, reticulum, omasum, and abomasum.
2. After the ruminant swallows its food without much chewing, the food goes to the first compartment, the rumen, where bacteria help break down the tough plant material through fermentation.
3. The food then returns to the mouth in the form of cud through a process called regurgitation, where the ruminant chews it again to further break it down into smaller particles for better digestion.
4. By re-chewing the food, ruminants are able to extract more nutrients from the plants they consume, making this type of digestive system efficient for processing large amounts of fibrous plant material.
Therefore, in the context of the question, the animal digestive system type that involves regurgitation and re-chewing of food is the Ruminant digestive system.
