Archaeoraptor: The Dino-Bird Hoax

National Geographic dergisinin kuşların evrimi senaryosunun delili olarak tanıttığı Archaeoraptor adlı "dino-kuş"un, bir yıl sonra sahte bir fosil olduğu ortaya çıktı.

Unable to find what they were looking for in Archaeopteryx, the advocates of the theory of evolution pinned their hopes on some other fossils in the 1990s and a series of reports of so-called "dino-bird" fossils appeared in the world media. Yet it was soon discovered that these claims were simply misinterpretations, or, even worse, forgeries.

The first dino-bird claim was the story of "feathered dinosaur fossils unearthed in China," which was put forward in 1996 with a great media fanfare. A reptilian fossil called Sinosauropteryx was found, but some evolutionist paleontologists who examined the fossil said that it had bird feathers, unlike known reptiles. Examinations conducted one year later, however, showed that the fossil actually had no structure similar to a bird's feather. A Science article titled "Plucking the Feathered Dinosaur" stated that the structures named as "feathers" by evolutionary paleontologists definitely had nothing to do with feathers:

Exactly 1 year ago, paleontologists were abuzz about photos of a so-called "feathered dinosaur," which were passed around the halls at the annual meeting of the Society of Vertebrate Paleontology. The Sinosauropteryx specimen from the Yixian Formation in China made the front page of The New York Times, and was viewed by some as confirming the dinosaurian origins of birds. But at this year's vertebrate paleontology meeting in Chicago late last month, the verdict was a bit different: The structures are not modern feathers, say the roughly half-dozen Western paleontologists who have seen the specimens. ...Paleontologist Larry Martin of Kansas University, Lawrence, thinks the structures are frayed collagenous fibers beneath the skin—and so have nothing to do with birds.138

A yet more sensational case of dino-bird hype broke out in 1999. In its November 1999 issue, National Geographic published an article about a fossil specimen unearthed in China which was claimed to bear both bird and dinosaur features. National Geographic writer Christopher P. Sloan, the author of the article, went so far as to claim, "we can now say that birds are theropods just as confidently as we say that humans are mammals." This species, which was said to have lived 125 million years ago, was immediately given the scientific name Archaeoraptor liaoningensis.139

However, the fossil was a fake and was skillfully constructed from five separate specimens. A group of researchers, among whom were also three paleontologists, proved the forgery one year later with the help of X-ray computed tomography. The dino-bird was actually the product of a Chinese evolutionist. Chinese amateurs formed the dino-bird by using glue and cement from 88 bones and stones. Research suggests that Archaeoraptor was built from the front part of the skeleton of an ancient bird, and that its body and tail included bones from four different specimens.

The interesting thing is that National Geographic published a high-profile article about such a crude forgery—and, moreover, used it as the basis for claiming that "bird evolution" scenarios had been verified—without expressing any doubts or caution in the article at all. Dr. Storrs Olson, of the famous Smithsonian Institute Natural History Museum in the USA, later said that he warned National Geographic beforehand that this fossil was a fake, but that the magazine management totally ignored him. According to Olson, "National Geographic has reached an all-time low for engaging in sensationalistic, unsubstantiated, tabloid journalism."140

In a letter he wrote to Peter Raven of National Geographic, Olson describes the real story of the "feathered dinosaur" hype since its launch with a previous National Geographic article published in 1998 in a very detailed way:

Prior to the publication of the article "Dinosaurs Take Wing" in the July 1998 National Geographic, Lou Mazzatenta, the photographer for Sloan's article, invited me to the National Geographic Society to review his photographs of Chinese fossils and to comment on the slant being given to the story. At that time, I tried to interject the fact that strongly supported alternative viewpoints existed to what National Geographic intended to present, but it eventually became clear to me that National Geographic was not interested in anything other than the prevailing dogma that birds evolved from dinosaurs.

Sloan's article takes the prejudice to an entirely new level and consists in large part of unverifiable or undocumented information that "makes" the news rather than reporting it. His bald statement that "we can now say that birds are theropods just as confidently as we say that humans are mammals" is not even suggested as reflecting the views of a particular scientist or group of scientists, so that it figures as little more than editorial propagandizing. This melodramatic assertion had already been disproven by recent studies of embryology and comparative morphology, which, of course, are never mentioned.

More importantly, however, none of the structures illustrated in Sloan's article that are claimed to be feathers have actually been proven to be feathers. Saying that they are is little more than wishful thinking that has been presented as fact. The statement on page 103 that "hollow, hairlike structures characterize protofeathers" is nonsense considering that protofeathers exist only as a theoretical construct, so that the internal structure of one is even more hypothetical.

The hype about feathered dinosaurs in the exhibit currently on display at the National Geographic Society is even worse, and makes the spurious claim that there is strong evidence that a wide variety of carnivorous dinosaurs had feathers. A model of the undisputed dinosaur Deinonychus and illustrations of baby tyrannosaurs are shown clad in feathers, all of which is simply imaginary and has no place outside of science fiction.

• Sincerely,
• Storrs L. Olson
• Curator of Birds
• National Museum of Natural History
• Smithsonian Institution141

This revealing case demonstrates two important facts. First, there are people who have no qualms about resorting to forgery in an effort to find evidence for the theory of evolution. Second, some highly reputable popular science journals, which have assumed the mission of imposing the theory of evolution on people, are perfectly willing to disregard any facts that may be inconvenient or have alternative interpretations. That is, they have become little more than propaganda tools for propagating the theory of evolution. They take not a scientific, but a dogmatic, stance and knowingly compromise science to defend the theory of evolution to which they are so strongly devoted.

Another important aspect of the matter is that there is no evidence for the thesis that birds evolved from dinosaurs. Because of the lack of evidence, either fake evidence is produced, or actual evidence is misinterpreted. In truth, there is no evidence that birds have evolved from another living species. On the contrary, all discoveries show that birds emerged on the earth already in full possession of their distinctive body structures.

Archaeopteryx and Other Ancient Bird Fossils

Confuciusornis, which lived at the same time as Archaeopteryx, has many similarities to modern birds.

Some recently found fossils also invalidate the evolutionist scenario regarding Archaeopteryx in other respects.

Lianhai Hou and Zhonghe Zhou, two paleontologists at the Chinese Institute of Vertebrate Paleontology, discovered a new bird fossil in 1995, and named it Confuciusornis. This fossil is almost the same age as Archaeopteryx (around 140 million years), but has no teeth in its mouth. In addition, its beak and feathers share the same features as today's birds. Confuciusornis has the same skeletal structure as modern birds, but also has claws on its wings, just like Archaeopteryx. Another structure peculiar to birds called the "pygostyle," which supports the tail feathers, was also found in Confuciusornis.134 In short, this fossil—which is the same age as Archaeopteryx, which was previously thought to be the earliest bird and was accepted as a semi-reptile—looks very much like a modern bird. This fact has invalidated all the evolutionist theses claiming Archaeopteryx to be the primitive ancestor of all birds.

Another fossil unearthed in China caused even greater confusion. In November 1996, the existence of a 130-million-year-old bird named Liaoningornis was announced in Science by L. Hou, L. D. Martin, and Alan Feduccia. Liaoningornis had a breastbone to which the muscles for flight were attached, just as in modern birds.135 This bird was indistinguishable from modern birds in other respects, too. The only difference was the teeth in its mouth. This showed that birds with teeth did not possess the primitive structure alleged by evolutionists. That Liaoningornis had the features of a modern bird was stated in an article in Discover, which said, "Whence came the birds? This fossil suggests that it was not from dinosaur stock."136

Another fossil that refuted the evolutionist claims regarding Archaeopteryx was Eoalulavis. The wing structure of Eoalulavis, which was said to be some 25 to 30 million years younger than Archaeopteryx, was also observed in modern slow-flying birds.137 This proved that 120 million years ago, there were birds indistinguishable from modern birds in many respects, flying in the skies.

These facts once more indicate for certain that neither Archaeopteryx nor other ancient birds similar to it were transitional forms. The fossils do not indicate that different bird species evolved from each other. On the contrary, the fossil record proves that today's modern birds and some archaic birds such as Archaeopteryx actually lived together at the same time. It is true that some of these bird species, such as Archaeopteryx and Confuciusornis, have become extinct, but the fact that only some of the species that once existed have been able to survive down to the present day does not in itself support the theory of evolution.

The Teeth and Claws of Archaeopteryx

Two important points evolutionary biologists rely on when claiming Archaeopteryx was a transitional form, are the claws on its wings and its teeth.

Just like Archaeopteryx, there are claw-like nails on the wings of the bird Opisthocomus hoazin, which lives in our own time.

It is true that Archaeopteryx had claws on its wings and teeth in its mouth, but these traits do not imply that the creature bore any kind of relationship to reptiles. Besides, two bird species living today, the touraco and the hoatzin, have claws which allow them to hold onto branches. These creatures are fully birds, with no reptilian characteristics. That is why it is completely groundless to assert that Archaeopteryx is a transitional form just because of the claws on its wings.

Neither do the teeth in Archaeopteryx's beak imply that it is a transitional form. Evolutionists are wrong to say that these teeth are reptilian characteristics, since teeth are not a typical feature of reptiles. Today, some reptiles have teeth while others do not. Moreover, Archaeopteryx is not the only bird species to possess teeth. It is true that there are no toothed birds in existence today, but when we look at the fossil record, we see that both during the time of Archaeopteryx and afterwards, and even until fairly recently, a distinct group of birds existed that could be categorised as "birds with teeth."

The most important point is that the tooth structure of Archaeopteryx and other birds with teeth is totally different from that of their alleged ancestors, the dinosaurs. The well-known ornithologists L. D. Martin, J. D. Stewart, and K. N. Whetstone observed that Archaeopteryx and other similar birds have unserrated teeth with constricted bases and expanded roots. Yet the teeth of theropod dinosaurs, the alleged ancestors of these birds, had serrated teeth with straight roots.127 These researchers also compared the ankle bones of Archaeopteryx with those of their alleged ancestors, the dinosaurs, and observed no similarity between them.128

Studies by anatomists such as S. Tarsitano, M.K. Hecht, and A.D. Walker have revealed that some of the similarities that John Ostrom and others have seen between the limbs of Archaeopteryx and dinosaurs were in reality misinterpretations.129 For example, A.D. Walker has analyzed the ear region of Archaeopteryx and found that it is identical to that of modern-day birds.130

Furthermore, J. Richard Hinchliffe, from the Institute of Biological Sciences of the University of Wales, studied the anatomies of birds and their alleged reptilian ancestors by using modern isotopic techniques and discovered that the three forelimb digits in dinosaurs are I-II-III, whereas bird wing digits are II-III-IV. This poses a big problem for the supporters of the Archaeopteryx-dinosaur link.131 Hinchliffe published his studies and observations in Science in 1997, where he wrote:

Doubts about homology between theropods and bird digits remind us of some of the other problems in the "dinosaur-origin" hypothesis. These include the following: (i) The much smaller theropod forelimb (relative to body size) in comparison with the Archaeopteryx wing. Such small limbs are not convincing as proto-wings for a ground-up origin of flight in the relatively heavy dinosaurs. (ii) The rarity in theropods of the semilunate wrist bone, known in only four species (including Deinonychus). Most theropods have relatively large numbers of wrist elements, difficult to homologize with those of Archaeopteryx. (iii) The temporal paradox that most theropod dinosaurs and in particular the birdlike dromaeosaurs are all very much later in the fossil record than Archaeopteryx.

As Hinchliffe notes, the "temporal paradox" is one of the facts that deal the fatal blow to the evolutionist allegations about Archaeopteryx. In his book Icons of Evolution, American biologist Jonathan Wells remarks that Archaeopteryx has been turned into an "icon" of the theory of evolution, whereas evidence clearly shows that this creature is not the primitive ancestor of birds. According to Wells, one of the indications of this is that theropod dinosaurs—the alleged ancestors of Archaeopteryx—are actually younger than Archaeopteryx: "Two-legged reptiles that ran along the ground, and had other features one might expect in an ancestor of Archaeopteryx, appear later."132

All these findings indicate that Archaeopteryx was not a transitional link but only a bird that fell into a category that can be called "toothed birds." Linking this creature to theropod dinosaurs is completely invalid. In an article headed "The Demise of the 'Birds Are Dinosaurs' Theory," the American biologist Richard L. Deem writes the following about Archaeopteryx and the bird-dinosaur evolution claim:

The results of the recent studies show that the hands of the theropod dinosaurs are derived from digits I, II, and III, whereas the wings of birds, although they look alike in terms of structure, are derived from digits II, III, and IV... There are other problems with the "birds are dinosaurs" theory. The theropod forelimb is much smaller (relative to body size) than that of Archaeopteryx. The small "proto-wing" of the theropod is not very convincing, especially considering the rather hefty weight of these dinosaurs. The vast majority of the theropod lack the semilunate wrist bone, and have a large number of other wrist elements which have no homology to the bones of Archaeopteryx. In addition, in almost all theropods, nerve V1 exits the braincase out the side, along with several other nerves, whereas in birds, it exits out the front of the braincase, though its own hole. There is also the minor problem that the vast majority of the theropods appeared after the appearance of Archaeopteryx.133

The Archaeopteryx Misconception

In response to the question whether there is any fossil evidence for "reptile-bird evolution," evolutionists pronounce the name of one single creature. This is the fossil of a bird called Archaeopteryx, one of the most widely known so-called transitional forms among the very few that evolutionists still defend.

Archaeopteryx, the so-called ancestor of modern birds according to evolutionists, lived approximately 150 million years ago. The theory holds that some small dinosaurs, such as Velociraptors or Dromaeosaurs, evolved by acquiring wings and then starting to fly. Thus, Archaeopteryx is assumed to be a transitional form that branched off from its dinosaur ancestors and started to fly for the first time.

However, the latest studies of Archaeopteryx fossils indicate that this explanation lacks any scientific foundation. This is absolutely not a transitional form, but an extinct species of bird, having some insignificant differences from modern birds.

The thesis that Archaeopteryx was a "half-bird" that could not fly perfectly was popular among evolutionist circles until not long ago. The absence of a sternum (breastbone) in this creature was held up as the most important evidence that this bird could not fly properly. (The sternum is a bone found under the thorax to which the muscles required for flight are attached. In our day, this breastbone is observed in all flying and non-flying birds, and even in bats, a flying mammal which belongs to a very different family.) However, the seventh Archaeopteryx fossil, which was found in 1992, disproved this argument. The reason was that in this recently discovered fossil, the breastbone that was long assumed by evolutionists to be missing was discovered to have existed after all. This fossil was described in the journal Nature as follows:

The recently discovered seventh specimen of the Archaeopteryx preserves a partial, rectangular sternum, long suspected but never previously documented. This attests to its strong flight muscles, but its capacity for long flights is questionable.124

This discovery invalidated the mainstay of the claims that Archaeopteryx was a half-bird that could not fly properly.

Morevoer, the structure of the bird's feathers became one of the most important pieces of evidence confirming that Archaeopteryx was a flying bird in the true sense. The asymmetric feather structure of Archaeopteryx is indistinguishable from that of modern birds, and indicates that it could fly perfectly well. As the eminent paleontologist Carl O. Dunbar states, "Because of its feathers, [Archaeopteryx is] distinctly to be classed as a bird."125 Paleontologist Robert Carroll further explains the subject:

The geometry of the flight feathers of Archaeopteryx is identical with that of modern flying birds, whereas nonflying birds have symmetrical feathers. The way in which the feathers are arranged on the wing also falls within the range of modern birds… According to Van Tyne and Berger, the relative size and shape of the wing of Archaeopteryx are similar to that of birds that move through restricted openings in vegetation, such as gallinaceous birds, doves, woodcocks, woodpeckers, and most passerine birds… The flight feathers have been in stasis for at least 150 million years…126

National Geographic's great hit, the "dino-bird."
Archaeoraptor soon turned out to be a hoax.

Another fact that was revealed by the structure of Archaeopteryx's feathers was its warm-blooded metabolism. As was discussed above, reptiles and dinosaurs are cold-blooded animals whose body heat fluctuates with the temperature of their environment, rather than being homeostatically regulated. A very important function of the feathers on birds is the maintenance of a constant body temperature. The fact that Archaeopteryx had feathers shows that it was a real, warm-blooded bird that needed to retain its body heat, in contrast to dinosaurs.

The Creation of Feathers

On the other hand, bird feathers have such a complex structure that the phenomenon can never be accounted for by evolutionary processes. As we all know, there is a shaft that runs up the center of the feather. Attached to the shaft are the vanes. The vane is made up of small thread-like strands, called barbs. These barbs, of different lengths and rigidity, are what give the bird its aerodynamic nature. But what is even more interesting is that each barb has thousands of even smaller strands attached to them called barbules. The barbules are connected to barbicels, with tiny microscopic hooks, called hamuli. Each strand is hooked to an opposing strand, much like the hooks of a zipper.

Just one crane feather has about 650 barbs on each of side of the shaft. About 600 barbules branch off the barbs. Each one of these barbules are locked together with 390 hooklets. The hooks latch together as do the teeth on both sides of a zip. If the hooklets come apart for any reason, the bird can easily restore the feathers to their original form by either shaking itself or by straightening its feathers out with its beak.

The Complex Structure of Bird Feathers

When bird feathers are studied closely, a very delicate design emerges. There are even tinier hairs on every tiny hair, and these have special hooks, allowing them to hold onto each other. The pictures show progressively enlarged bird feathers.

To claim that the complex structure of feathers could have come about by the evolution of reptile scales through chance mutations is quite simply a dogmatic belief with no scientific foundation. Even one of the doyens of Darwinism, Ernst Mayr, made this confession on the subject some years ago:

It is a considerable strain on one's credulity to assume that finely balanced systems such as certain sense organs (the eye of vertebrates, or the bird's feather) could be improved by random mutations.122

Feathers also compelled Darwin to ponder them. Moreover, the perfect aesthetics of the peacock's feathers had made him "sick" (his own words). In a letter he wrote to Asa Gray on April 3, 1860, he said, "I remember well the time when the thought of the eye made me cold all over, but I have got over this stage of complaint..." And then continued: "... and now trifling particulars of structure often make me very uncomfortable. The sight of a feather in a peacock's tail, whenever I gaze at it, makes me sick!"123

In short, the enormous structural differences between bird feathers and reptile scales, and the extraordinarily complex structure of feathers, clearly demonstrate the baselessness of the claim that feathers evolved from scales.

Bird Feathers and Reptile Scales

Another impassable gulf between birds and reptiles is feathers, which are peculiar to birds. Reptile bodies are covered with scales, and those of birds with feathers. The hypothesis that bird feathers evolved from reptile scales is completely unfounded, and is indeed disproved by the fossil record, as the evolutionary paleontologist Barbara Stahl admits:

How [feathers] arose initially, presumably from reptiles scales, defies analysis... It seems, from the complex construction of feathers, that their evolution from reptilian scales would have required an immense period of time and involved a series of intermediate structures. So far, the fossil record does not bear out that supposition.116

A. H. Brush, a professor of physiology and neurobiology at the University of Connecticut, accepts this reality, although he is himself an evolutionist: "Every feature from gene structure and organization, to development, morphogenesis and tissue organization is different [in feathers and scales]."117 Moreover, Professor Brush examines the protein structure of bird feathers and argues that it is "unique among vertebrates."118

There is no fossil evidence to prove that bird feathers evolved from reptile scales. On the contrary, feathers appear suddenly in the fossil record, Professor Brush observes, as an "undeniably unique" character distinguishing birds.119 Besides, in reptiles, no epidermal tissue has yet been detected that provides a starting point for bird feathers.120

Many fossils have so far been the subject of "feathered dinosaur" speculation, but detailed study has always disproved it. The prominent ornithologist Alan Feduccia writes the following in an article called "On Why Dinosaurs Lacked Feathers":

Feathers are features unique to birds, and there are no known intermediate structures between reptilian scales and feathers. Notwithstanding speculations on the nature of the elongated scales found on such forms as Longisquama ... as being featherlike structures, there is simply no demonstrable evidence that they in fact are.121

The Sinosauropteryx fossil, announced by evolutionary paleontologists to be a "feathered dinosaur," but which subsequently turned out to be no such thing.

Reptile Scales

The scales that cover reptiles' bodies are totally different from bird feathers. Unlike feathers, scales do not extend under the skin, but are merely a hard layer on the surface of the animal's body. Genetically, biochemically and anatomically, scales bear no resemblance to feathers. This great difference between the two again shows that the scenario of evolution from reptiles to birds is unfounded.

The Unique Structure of Avian Lungs

Another factor demonstrating the impossibility of the reptile-bird evolution scenario is the structure of avian lungs, which cannot be accounted for by evolution.

In land-dwelling creatures, air flow is bidirectional. Upon inhaling, the air travels through the passages in the lungs (bronchial tubes), ending in tiny air sacs (alveoli). The exchange of oxygen and carbon dioxide takes place here. Then, upon exhaling, this used air makes its way back and finds its way out of the lung by the same route.

Reptile Lung

Avian Lung

1. Air Flow
2. Alveoli
3. Bronchi
4. Air Flows In
5. Parabronchi
6. Air Flows Out

Bird lungs function in a way that is completely contrary to the way the lungs of land animals function. The latter inhale and exhale through the same passages. The air in bird lungs, in contrast, passes continuously through the lung in one direction. This is made possible by special air sacs throughout the lung. By means of this system, whose details can be seen overleaf, birds breathe nonstop. This is peculiar to birds, which need high levels of oxygen during flight. It is impossible for this structure to have evolved from reptile lungs, because any creature with an "intermediate" form between the two types of lung would be unable to breathe.

In birds however, air is unidirectional. New air comes in one end, and the used air goes at the other end. By means of special air sacs all along the passages between them, air always flows in one direction through the avian lung. In this way, birds are able to take in air nonstop. This satisfies birds' high energy requirements. This highly specialized respiratory system is explained by 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.111

The important thing is that the reptile lung, with its bidirectional air flow, could not have evolved into the bird lung with its unidirectional flow, because it is not possible for there to have been an intermediate model between them. In order for a creature to live, it has to keep breathing, and a reversal of the structure of its lungs would inevitably end in death. According to evolution, this change must happen gradually over millions of years, whereas a creature whose lungs do not work will die within a few minutes.

13. Stale air
14. Fresh air moves out of the rear air sacs to the lungs.
15. Stale air is expelled from the front air sacs.
16. Lung

Birds' Special Respiratory System

Breathing In: The air which enters birds' respiratory passages goes to the lungs, and to air sacs behind them. The air which is used is transferred to air sacs at the front.

Breathing Out: When a bird breathes out, the fresh air in the rear air sacs goes into the lungs. With this system, the bird is able to enjoy a constant supply of fresh air to its lungs.

There are many details in this lung system, which is shown in very simplified form in these diagrams. For instance, there are special valves where the sacs join the lungs, which enable the air to flow in the right direction. All of these show that there is clearly “creation” at work here. These special systems not only deal a death blow to the theory of evolution, they are also among the innumerable proofs of the fact of creation.

1. Trachea
2. Front Air Sacs
3. Rear Air Sacs
4. Lung
5. Fresh air
6. Fresh air
7. Stale air
8. Trachea

9. Fresh air does not pass through flont air sacs
10. Rear air sacs are filled with fresh air
11. Front air sacs are filled with the stale air coming from the lungs
12. Lung

Michael Denton states that it is impossible to give an evolutionary account of the avian lung:

Just how such an utterly different respiratory system could have evolved gradually from the standard vertebrate design is fantastically difficult to envisage, especially bearing in mind that the maintenance of respiratory function is absolutely vital to the life of an organism to the extent that the slightest malfunction leads to death within minutes. Just as the feather cannot function as an organ of flight until the hooks and barbules are coadapted to fit together perfectly, so the avian lung cannot function as an organ of respiration until the parabronchi system which permeates it and the air sac system which guarantees the parabronchi their air supply are both highly developed and able to function together in a perfectly integrated manner.112

Parabronchial tubes, which enable air to circulate in the right direction in birds' lungs. Each of these tubes is just 0.5 mm. in diameter.

In brief, the passage from a terrestrial lung to an avian lung is impossible, because an intermediate form would serve no purpose.

Another point that needs to be mentioned here is that reptiles have a diaphragm-type respiratory system, whereas birds have an abdominal air sac system instead of a diaphragm. These different structures also make any evolution between the two lung types impossible, as John Ruben, an acknowledged authority in the field of respiratory physiology, observes in the following passage:

The earliest stages in the derivation of the avian abdominal air sac system from a diaphragm-ventilating ancestor would have necessitated selection for a diaphragmatic hernia in taxa transitional between theropods and birds. Such a debilitating condition would have immediately compromised the entire pulmonary ventilatory apparatus and seems unlikely to have been of any selective advantage.113

Another interesting structural feature of the avian lung which defies evolution is the fact that it is never empty of air, and thus never in danger of collapse. Michael Denton explains the position:

Just how such a different respiratory system could have evolved gradually from the standard vertebrate design without some sort of direction is, again, very difficult to envisage, especially bearing in mind that the maintenance of respiratory function is absolutely vital to the life of the organism. Moreover, the unique function and form of the avian lung necessitates a number of additional unique adaptations during avian development. As H. R. Dunker, one of the world's authorities in this field, explains, because first, the avian lung is fixed rigidly to the body wall and cannot therefore expand in volume and, second, because of the small diameter of the lung capillaries and the resulting high surface tension of any liquid within them, the avian lung cannot be inflated out of a collapsed state as happens in all other vertebrates after birth. The air capillaries are never collapsed as are the alveoli of other vertebrate species; rather, as they grow into the lung tissue, the parabronchi are from the beginning open tubes filled with either air or fluid.114

In other words, the passages in birds' lungs are so narrow that the air sacs inside their lungs cannot fill with air and empty again, as with land-dwelling creatures.

If a bird lung ever completely deflated, the bird would never be able to re-inflate it, or would at the very least have great difficulty in doing so. For this reason, the air sacs situated all over the lung enable a constant passage of air to pass through, thus protecting the lungs from deflating.

Of course this system, which is completely different from the lungs of reptiles and other vertebrates, and is based on the most sensitive equilibrium, cannot have come about with unconscious mutations, stage by stage, as evolution maintains. This is how Denton describes this structure of the avian lung, which again invalidates Darwinism:

The avian lung brings us very close to answering Darwin's challenge: "If it could be demonstrated that any complex organ existed, which could not possibly have been formed by numerous, successive, slight modifications, my theory would absolutely break down."115