Cassell's Book of Birds, Reading 1
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Physiology of a Bird's Chest
The lungs of a bird are not suspended like those of a quadrupid within a circumscribed chest or thoracic cavity in such a manner as to become inflated by each inspiration. They are rather to be described as soft, porous and highly vascular organs through which the air passes as through the interior of a sponge. By this process, it is obvious that the vital element, the oxygen of the atmosphere, being admitted to every part of the system, the blood is vitalized to the greatest possible extent. As the blood circulates through the system, it carries with its heat and life in superabundance. Its temperature is raised until the heat of the body of a bird is far
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