Evolution cannot account for the structure of avian lungs.
AVIAN LUNGS :
Evolution cannot account for the structure of avian lungs, .
LAND DWELLING CREATURES ( Carnivorous Theropods ..Dinosaurs ) air flow
is bidirectional. Inhaling, air travels through the passages in the
lungs (bronchial tubes), ending in tiny air sacs (alveoli). Exchange of
oxygen and carbon dioxide takes place here. Exhaling..., this used air makes its way back and finds its way out of the lung by the same route.
BIRDS air is unidirectional. New air comes in one end, and used air
goes at the other end. Special air sacs all along the passages between
them, air flows in one direction through the avian lung. Therefore
birds are able to take in air nonstop. This satisfies birds' high
energy requirements.
Michael Denton in his book A Theory in Crisis:
In the case of birds, the major bronchi break down into tiny tubes
which permeate the lung tissue. These so-called parabronchi eventually
join up together again, forming a true circulatory system so that air
flows in one direction through the lungs. ...[T]he structure of the
lung in birds and the overall functioning of the respiratory system is
quite unique. No lung in any other vertebrate species is known which in
any way approaches the avian system. Moreover, it is identical in all
essential details in birds as diverse as humming birds, ostriches and
hawks.
Michael Denton, A Theory in Crisis, Adler & Adler, 1986, pp. 210-211
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