To take what Gilthalion said a step further, I think the reason that the Mirkwood spiders talked was because, as aforementioned, they were more social, so it is possible that the Mirkwood spiders developed vocal chords over time, since they would need some way to communicate, whereas Shelob, being a loner, wouldn't have much use of a voice.
This theory would probably only work if Darwin was right about evolution.
[ January 16, 2003: Message edited by: Nevfeniel ]
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Consider the purr a variety of audible tranquilizer. [. . .] For a few of us, there is one more purr, a secret purr. When we combine our secret purrs, we produce the Purr of Power. And that is simply the amplified amity we feel as furred and purred beings.
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