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Originally Posted by Rune Son of Bjarne
Is the first part about the wings a joke? It is just that I cannot see how there can be common knowledge about a fable-animal, the descirption of dragons are very different depending on what part of the world you are in and in some places there are no "given" form that the dragon has.
About Smaug needing thermal updrafts: It is a possibility, but would that not limit is mobility? It would be extremely difficult for him to fly away from whatever mountain range he was living by, just like you never see the big vultures of South America very far from the mountains.
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Not a joke, given their relatively small wings, dragons must fly like a hummingbird or bumblebee does, with a high-speed rotary wingstroke. Also they have hollow bones for lightness, and very long, sticky tongues for fishing dwarves out of deep holes in the ground. Dragons like Smaug also exude a thick, sticky mucilage from their undersides that allows jewels and other treasure to stick permanently to them. The spot over their heart is mucilage-free, for reasons unknown.
But alas, some dragons are born too fat or become so with age, and must exist as winged but flightless animals, like penguins. Smaug could still fly, but probably not for very long (glycogen depletion would get him in the end, just like it should have poor Gimli). So he wanted the bridge intact so he could waddle into Laketown on his legs and really have his way with the place in a nice slow fashion.