Extended Data Fig. 4: Axial µCT images of the SPD in B. jamaicensis and B. swainsoni, showing variation and capacity for differential and asymmetric inflation and collapse of the structure.
From: The respiratory system influences flight mechanics in soaring birds
Each axial slice was selected in the multiplanar reconstruction (MPR) viewer in Horos or OsiriX MD with the window aligned perpendicular to the thoracic (dorsal) vertebrae and sternal keel, and the axial slice was selected at the location where the coracoids articulate with the sternal plate. a, Ptolemy (B. jamaicensis): adult male, deceased, artificially inflated to maximum inspiratory capacity. b, Lysimachus (B. jamaicensis): adult male, deceased, natural end tidal volume. c, Alexander (B. jamaicensis): sub-adult female, deceased, artificially inflated to near-maximum inspiratory capacity. d, Seleucus (B. jamaicensis): adult male, deceased, artificially inflated to near/at maximum inspiratory capacity. e, Roxana (B. jamaicensis): adult female, live and sedated, natural apnoea. f, Olympias (B. jamaicensis): adult female, live and sedated, natural apnoea; note the total collapse of her SPD. g, Polyperchon (B. swainsoni): adult male, deceased, artificially inflated to near/at maximum inspiratory capacity, wings extended. h, Eurydice (B. swainsoni): adult female, live and sedated, natural apnoea.