Extended Data Fig. 1: Details of intubation and anatomy of the subpectoral diverticula in the red-tailed hawk (Buteo jamaicensis).
From: The respiratory system influences flight mechanics in soaring birds
a, Adult male specimen (Ptolemy) in ventral view. b, View of the tracheotomy with a medium sized polyethylene tube sutured into the cut trachea with silk Ethicon suture, and pectoralis muscle (p) exposed by dissection. c, Magnified view of b with the pectoralis reflected cranially on the left side; arrow indicates the inflated SPD. d, Right inflated SPD (indicated by the arrow) is exposed as the pectoralis is reflected cranially with forceps. Scale bars, 1 cm.