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Rabbits and guinea pigs are small mammals with high metabolic rate and higher oxygen demands compare to large animals. Increased oxygen intake is favored not by larger lungs but by a serials of anatomical modification of conformation, airwaves distribution and structure. Using gross dissection the lung anatomy and division was documented. Both rabbits and guinea pigs are nose breathers because larynx is placed high in the oropharynx where it can directly access the nasopharynx. The lungs were asymmetrical in dimensions; the right lung being larger than the left lung, having the same lobe divisions: cranial, middle and caudal. In rabbits the thorax is small in contrast with the large abdomen. The thymus is frequently found in adult rabbits. In guinea pigs the lungs show deep incisures. Both in rabbits and guinea pigs respiration is made due to the anatomical particularities of thoracic cavity and its components with diaphragm acting as the main respiratory muscle.

Comparative Anatomical Study of Lungs in Domestic Rabbits (Oryctolagus cuniculus) and Guinea Pigs (Cavia porcellus)