Page 74 - The Origin of Birds and Flight

72 The Origin of Birds and Flight

Another feature that challenges the evolution of the avian lung is its
special structure which, when deprived of air, faces the danger of col-
lapsing. Michael Denton explains:

Beak
Gullet
Neck sac
Windpipe The respiratory system in birds is
Cyrinx a marvel of engineering, too per-
Sac in scapula Bronchi fect to be the result of chance—
which clearly invalidates evolu-
Front breast tionist claims.
sac

Intermediate
central bronchi
Lung
Rear bronchi
External
bronchi
Rear breast sac
Abdominal
bronchi
Abdominal sac