File:Cranial sinus and postcranial air sac systems in birds.svg
From Infogalactic: the planetary knowledge core

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Summary
The respiratory system in a bird, showing lungs, abdominal air sac, anterior thoracic air sac, cervical air sac, clavicular air sa, humeral diverticulum of the clavicular air sac, paranasal sinus, posterior thoracic air sac, paratympanic sinus, and trachea.
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Lua error in package.lua at line 80: module 'strict' not found.
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 00:14, 4 January 2017 | ![]() | 683 × 541 (91 KB) | 127.0.0.1 (talk) | The respiratory system in a bird, showing lungs, abdominal air sac, anterior thoracic air sac, cervical air sac, clavicular air sa, humeral diverticulum of the clavicular air sac, paranasal sinus, posterior thoracic air sac, paratympanic sinus, and trachea. |
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