Airflow Patterns in Animals Lungs (IMAGE) University of Utah Caption Different types of airflow patterns in animal lungs. Mammals (top left) have a tidal airflow pattern where air moves to-and-fro through a branching network of bronchi. Birds (top right) have looping bronchi and air moves in the same direction during both inspiration and expiration through many of these bronchi. Monitor lizards (below) have a net-unidirectional airflow pattern where air moves to-and-fro, but more air moves forward or backward over the whole ventilatory cycle in each parts of the lung. White arrows show net flow over the whole ventilatory cycle. Credit Robert Cieri Usage Restrictions Non-commercial with attribution License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.