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Animal biology. Zoology; Biology. CLASS AVE3 407 The lungs of birds are not capable of dilation since the thoracic skeleton forms a rigid framework. Breathing is allowed by the presence of
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Science Fact Friday: Bird lungs! Just like every... | science, art, and science art
Air Sac - an overview | ScienceDirect Topics
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Multimedia Gallery - Pulmonary air-sac systems of dinosaurs and birds exhibit striking similarities | NSF - National Science Foundation
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Evidence for Avian Intrathoracic Air Sacs in a New Predatory Dinosaur from Argentina | PLOS ONE