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Key terms: birds bones lungs air sacs scales muscles beak ribs keel fused ovary anterior pectoral trachea sternum femur toes gizzard vertebrae posterior syrinx feathers cloaca muscular innominate pelvis cervical girdle metatarsus caudal mammalian humerus scapula furcula some birds exhalation coracoid esophagus some reptiles vertebrate inhalation circulatory respiration body weight thoracic air through the lungs carbon dioxide skeletal system anterior air sacs anatomical terms of location Search external links cited by footnotes on Wikipedia page Bird anatomy: |
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