I don't believe in evolution, and Tolkien was also a Christian, not an evolutionist. So, if he believed some birds were created with wings, but without the ability to fly, there is a possibility that's how he made balrogs. I'm not saying that's the case; it's just a possibility. Maybe Tolkien didn't mean for balrogs to have wings. I think that this matter of balrogs having wings will be discussed as long as there are LotR fans to discuss it, and there will never be a set answer, as Tolkien obviously isn't going to be writing anymore.
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Will Turner: "This is either madness or brilliance."
Jack Sparrow: "It's remarkable how often those two traits coincide." ~ Pirates of the Caribbean
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