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Jean Low asked Fire breathing dragons?
Why is there little information online about how fire breathing dragons could/could not exist? I've seen one poorly written article that came close to a hypothesis(online.) Just curious about the logistics, if it can happen?
And got the following answer:
I'll take a stab at this. Thanks for asking this question. I had a lot of fun with it. Once upon a time, a long, long time ago, there was a lizard. We'll call him Maury, because he likes it (his real name is Maurice.) 200 million years ago: Maury is a wholly unremarkable lizard, a normal representative of his particular species. Although he is large by modern standards, at about 18" total length, he is positively puny compared to the enormous lizards of his time. His species is truly typical, notable only for two features: 1) the rudimentary toxin it secrets to kill insects and smaller reptiles and 2) a thin fringe around its neck that extends down its back and axial folds. Maury can expand this fringe to make himself appear larger to predators, much like frilled lizards today. Maury himself has been suffering as of late. A genetic condition has rendered his immune system less able to fight off fungi infections, and the fungal infection in his lower bowel is causing considerable discomfort. What he doesn't know is that the mold is probably saving his life. Maury's population is currently being devastated by a rampant bacterial infection in the local wood-beetles. The antibacterial agent produced by the mold, while uncomfortable, renders him immune to infection. This tiny advantage will have huge consequences for his offspring. 150 million years ago Maury's great-to-the-5*10^7 granddaughter clings to a branch, watching for any movement in the forest below. She is an adept predator, slightly smaller and lighter than Maury but much quicker and more agile. Her back frill has evolved into a thin membrane which she may extend out almost two feet, nearly tripling her body surface area. This allows her some control over her body temperature, a useful trait in the changing climate. She is not a robust animal, but doesn't need to be. The venom produced by the glands in the back of her throat has evolved into a potent and caustic toxin, made up primarily of organic peroxides and viscous proteins. This has the added benefit of making Maury 5*10^7 poisonous to predators as well as prey. Maury 5*10^7 is in luck today. She spies a smaller lizard about ten feet down on a nearby tree. She adjusts her position and leaps down to her prey, extending her frill as she does so. The frill catches the air below her, slowing her descent slightly and preventing her from injuring herself as she strikes her target. The animal squeals in pain and bounds away. Maury doesn't pursue. She knows that her prey will die in a day or two. Maury 5*10^7 should be grateful to her grandfather for his endurance. Bacterial resistance is a highly selectable trait. Maury's descendants retained the genetic flaw that allowed them to colonize fungi in their digestive system. The particular fungus strain has evolved as well, becoming a symbiotic organism. This fungus also produces dilute ethanol and methanol as a byproduct of its metabolism. Maury 5*10^7 can regurgitate these antiseptic fluids, disinfecting her digestive tract in the process. This allows her eat food that would be too putrid to be edible by other species. Her species has developed this trait into a hunting tactic, allowing them to attack prey by stealth and retreat, conserving energy and limiting the risk of injury. She'll be able to track her escaped prey easily by the smell of festering flesh that her venom causes. 100 million years ago Maury 1*10^8 spies a small mammal rooting through the underbrush, and poises to swoop down upon it. He is longer, thinner, and more streamlined than his ancestors, and his dorsal membrane has become a gliding wing, supported by a framework of tendon and hollow bone, a modified vertebrae. Stretching out this membrane allows him to leap incredible distances from tree to tree. He can also break, and to some degree guide, his descent, allowing him to make surprise attacks on the small rodent-like mammals that live on the forest floor. Combined with the potent caustics produced by his venom glands, it’s a swift and effective killing tactic. The predators are bigger in this age, and Maury 1*10^8 has had to develop better mechanisms for self-defense. Luckily, his forbearers provided him with a complex bioweapons factory. His digestive tract contains a recently-evolved organ, a small sac that produces digestive fluid and acts as an incubator for a hardy colony of fungus. The colonizer has a self-limiting mechanism to control fungal growth; when the concentration of fermented alcohols reaches 12-13%, the alcohol starts killing off the mold. Thus, Maury 1*10^8 has a self-regulating and constant supply of caustics and digestive acids that he can expel with force. When endangered, he can spit this mixture at predators up to 12 feet away, causing intense pain and possible blindness. The higher alcohol concentrations have necessitated the evolution of alcohol metabolism. Maury 1*10^8’s liver can break down alcohol and feed the byproducts back into his stomach to be reabsorbed. He dives upon the unaware rodent, only opening his wings to break his fall before the kill. 65 million years ago Pterosaurs rule the skys above the waves, but Maury 1.4*10^8 controls the air above the land. He is a formidable beast, having attained a wingspan of over twenty feet. These thick, leather-like wings support a serpentine body that terminates in a long , spatulate tail. Unlike the spoon-shaped beaks of his fish-eating pterosaur cousins, Maury 1.4*10^8’s mouth is a mass of muscle and fangs, built for crushing the bones of the larger land animals that he preys on, creatures that sometimes outweigh him four or five times over. His ancestors developed an elaborate method of accomplishing that feat. Maury 1.4*10^8’s digestive sytem is an incredibly complex system, producing volatile chemicals in ever-increasingly precise combinations. His eyes, well-attuned for distance vision, spy a lumbering ox-like beast grazing in a field far below. Normally, he would never attempt to take down prey so large, but Maury 1.4*10^8 is desperate. He hasn’t had a meal in over a week. He dives toward the great beast, wings folded back, talons tucked close to his body. As he closes on his prey, muscles in his abdomen contract, violently spraying the toxic products of his digestive system outward, twenty feet ahead of his gaping mouth. This is the initial attack, an attempt at stunning his victim. It’s the only thing that allows him to even consider attacking so large a foe. At the same time, the sphincters to his several venom sacs open, allowing the toxins to flow into a small chamber in his nasopharynx and begin coating the interior of his mouth in preparation of the first bite. Something’s different this time, though. Maury 1.4*10^8 has a congenital defect of the valve that opens from the venom chamber to the pharyx. It is thicker than normal, and does not always open properly. The various organic chemicals, including hydrogen peroxide and hydroquinone, mix with albumin in the chamber in an exothermic reaction. Normally, this trait merely adds to the deadliness of his bite, but today the reaction has nowhere to go. The heat and pressure build in the chamber until the valve finally pops open. A jet of hot, volatile gases explode into his nasopharanx, where they meet the pressurized digestive fluids. The heat of the gas ignites acetaldehyde, a byproduct of alcohol metabolism with a very low flash point. The burning acetaldehyde ignites the spray of methanol and ethanol, forcing a gout of blue flame from the creature’s mouth. Maury 1.4*10^8 is startled and checks his flight, hitting the ground hard. The explosion could have injured his mouth or lungs, but millions of generations of exposure to caustics had produced hard, chitonous protection for his palate and pharynx, as well as providing valves that do not allow him to inhale while expelling fluids. He looks back at his prey, charred around its face and dead on the spot. Maury I’s ancestor will eat well this night. 20 million years ago Maury 1.7*10^8 suns lies on a fallen log, wings stretched out to their full sixty foot span to catch the sun’s rays and warm his body. He has just devoured an entire entolodont, as evidenced by the bulge in his midsection, and now must rest and digest his meal. Once he is able to move effectively again, he will crawl away, curling his 25ft long body into an underground burrow, where he can live off of the digesting carcass for up to three months. After this time, he will regurgitate the animal’s skeleton and hunt again. This adaptation was a necessary response to the changing climate and conditions of his environment. His ancestors were never prolific species, having a limited range in what is now Northern Africa and Southern Asia, and they nearly went exinct during the Cretaceous-Tertiary period. Unlike their marine pterosaur cousins, though, they were well equipped to hunt the terrestrial megafauna of their time with a minimum of expended energy, making them the only significant predator of those huge animals. As the size of their prey increased, so did their own. That, along with the general cooling of the climate forced these already lazy creatures to be even more efficient with energy use and begin hibernating for extended periods. Maury has no complaints. He is the most formidable land predator in history, yet he only has to hunt a few times a year. 100,000 years ago Maury 1.8*10^8 is in a bad way. His belly is full, to be sure, but he did not appreciate being woken. More importantly, he sports a deep wound on the side of his belly, the product of a sharpened fleck of obsidian wielded by very bright ape. That particular ape wasn’t quite bright enough to avoid becoming dinner, but he had lots of friends who were, and their rocks were getting sharper all the time. Maury 1.8*10^8’s tiny reptilian brain didn’t know it, but those apes meant big trouble for him and his. As an apex predator, his ancestors had no need to fear any other beast, but now he faced an enemy who fought and killed in brand new ways, enemies that would work together and hunt him down simply out of fear. He had won this day, but it couldn’t last. Today Early man almost succeeded. He proliferated quickly and almost thoroughly, and everywhere he went carried the memory of giant monsters who had discovered fire before they did. They were killed when they were uncovered, until only children really believed that they ever actually existed. They did exist, though, as they do now, sleeping in shared burrows scattered across the unexplored jungles of Southeast Asia. They are huge beasts, and the hard years have toughened their skins (both figuratively and literally) quite a bit. Both for hiding, and to support their enormous bodies, they hibernate for an entire year at a time, only emerging from their lairs during the hottest parts of the summer. Hunting most often in groups of three or four, they feed voraciously on jungle pigs, crocodiles, and other large prey, gorging themselves until full before retiring once more to breed and sleep. Natives sometimes claim to have seen them, or report missing livestock, but scholars dismiss these claims as ludicrous folk tales. No one really believes in dragons any more… and that’s exactly how they like it.