Tracheobronchoscopy. A) Greek tortoise (Testudo graeca) trachea with complete tracheal rings. B) Ball python (Python regius) trachea with obvious dorsal ligament (arrow). C) Tracheal bifurcation and primary bronchi in a green iguana (Iguana iguana). D) Simple sac-like lung in a green iguana. E) Compartmentalized lung in a panther chameleon (Furcifer pardalis). F) Granulomatous pneumonia due to Mycobacterium spp in a ball python.