bird (pigeon) respiratory system in ventral view. .

bird pigeon respiratory system ventral view vector birds highly efficient adapted meet metabolic unique air sac continuous flow oxygen providing constant supply fresh inhalation exhalation additionally lungs compact densely packed millions tiny capillaries enabling exchange ensuring optimal flight activities bird system labelled diagram parts sac structure anatomical anatomy anatomy muscles avian biology bronchi bronchus cervical clavicular education extraclavicular humeral larynx lung lungs organs pigeon posterior respiratory science syrinx trachea vector zoology design