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Originally Posted by Pyritie
Dinosaurs were gigantic lizards
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Not true at all! Dinosaurs were as closly linked to lizards as mamals arw as far as their bodies go. Dinosaurs had extreemly fast matabolisims like mamals and were warm blooded which is the oposit of most lizards. They also had bone structure similar to birds and mamals with lots of huge bloodvesals running through the bone. They also could run extreemly fast at speeds that even modern cars might struggle to keep up with offroad. Thus just because they had small brains does not mean a large lizard would.
Mecheon is right about how they possiablly could not exist, and like I said if they were to exist, they would probably be created (man made via genetic enginering) or appear as an alien species on some unexplored planet that we do not know even exists orbe in some paralel universe. There are no facts that back them ever having existed (sadly).
May I remind you this is not a debate over if they existed, but more a descussion about their possiable phisical characteristics and other things like that.
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Originally Posted by Pyrite
Nature has created some interesting creations. If she can make a bug that squirts a superheated liquid from its ass, then why not fire breathing?
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Yes but those beetles used it for self defense and it was purly a chemical reaction that caused it. But just think about fire breathing logically. Firstly why would dragons need it? The answer to that is they would not as fire breathing would not help them capture food in any way, and probably would hinder them as it would mean other charasteristics would have to be removed. Also fire breathing is a usless form of self defense, as humans nowdays can easilly manufacture clothing that is flame resiliant and also when they fight eachother, their claws would be doing most of the damage as fire would mearly damage the surface of their scales (which are dead anyway). Next the ammount of enenrgy needed to breath fire is astronomical, especially to super heat it to a temperatre it actually does anything (1000°C+). This would mean on top of the highly energy demanding process of flying, they would need to spend even more energy just to breath fire. Also if they used it to hunt, they would have minimal net energy left to actually grow or live off. This is espically stupid considering they could hunt perfectly well with out breathing fire. And finally it is a huge risc to the actual dragon in question itself as if the chemicals burn inside it, it would literally selfcombust. This would also be very likly to happen in a fight as lizards tend to bite each other's necks and so with fire breathing that would be a problem.
Overall dragons would be unlikely to breathe fire by themselves as it would not be an evolutionary advantage and also would be un nesecescary. Since remember that fire breathing would also reduce the ammount of food they find as there would be a lot more forest fires and so less animals.
One can not deny a dragon is physically possiable, just it makes no evolutionary sence to ever have been created.