This masterclass will provide the foundation for understanding the diverse forms of normal respiratory anatomy in amphibians and reptiles. The goal is to provide veterinarians and veterinary technicians with fundamental understanding of upper and lower respiratory structure and functions in Amphibians (anurans, caudates, and caecilians) and reptiles (chelonians, crocodilians, squamate [lizards and snakes], and rhynchocephalians. Lung structural diversity is great; the differences are functionally important to the health of the animals. In addition to basics airway structures and lung forms, cutaneous respiration will be covered for those taxa for which it is particularly important. Within amphibians and reptiles there are diverse mechanisms providing for gas exchange. In the amphibia, gas exchange may occur at gills, buccopharyngeal membranes, cutaneously, and via pulmonary surfaces. Across the reptile, gas exchange usually is via lungs, however in come taxa cutaneous gas exchange (including via cloacal and buccopharyngeal membranes) may occur. Knowing the diversity or structures and mechanisms of respiration relevant to the health of the animals.