When compared to mammals, the bones of birds are lighter in weight and may contain small diverticula filled with air. These bones are call what?
Pneumatic bones. Examples of pneumatic bones are the skull, humerus, clavicle, keel, femur, pelvic girdle, lumbar and sacral vertebrae. These bones contain small diverticula filled with air and give the bone a corrugated appearance versus a solid appearance of the non-pneumatic bone.