Explain the major differences between reptilian and avian digestive systems.

The digestive systems of reptiles and birds exhibit several key differences due to their distinct evolutionary adaptations and ecological needs.

One of the major differences is the structure of the stomach. Reptiles have a simple stomach that can be divided into two parts: the glandular stomach (or proventriculus) and the muscular stomach (or ventriculus). The proventriculus secretes digestive enzymes, while the __________ ______ __________ ______ ____ ____ ______ _______.
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