Rodents cannot regurgitate due to their physiology.

• A. True
• B. False
• C. Not applicable
• D. Unknown

Answer: (A)

Rodents lack a regurgitation reflex, so they do not regurgitate as a normal physiological response. The mechanisms that drive regurgitation and vomiting in many other animals are not functionally present or are minimal in rodents—the brainstem emetic/vomiting circuitry and the associated neural pathways are not configured to produce retrograde expulsion of stomach contents. Because of this, regurgitation is not a typical part of rodent physiology. In practice, if a rodent shows regurgitation-like signs, it often points to a pathology such as esophageal or dental issues rather than a normal regurgitative process.