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