Why do you have to be so logical about it? Would it be so hard to grab your copy of LOTR and try to find them? They were not just a means of making the Ents look good. Tolkien was a great writer and you can be sure that if he put them in there then they clearly serve some kind of purpose.
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Remember, stranger, passing by: As you are now, so once was I. As I am now, so you shall be. Prepare thyself to follow me.
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