Shelob was a lesser "beast" compared to Ungoliant. Though she came from the latter, it didn't exactly mean a "direct" daughter (I could be wrong).
Shelob definitely didn't have Ungoliant's unsatiable hunger (sheez, she already sapped the two trees' lights and she was still hungery!), though hungery she always seemed to be. Even Melkor was afraid of Ungoliant.
But remember that Tolkiens works sometimes are different from his earlier writings (as I'm discovering, but all are very interesting). So I guess it depends on which book you're reading presently, and which you're trying to compare it with (comparing his books with earlier writings is NOT advisable, unless you are a genius on this, it’ll confuse the living daylights out of you – I should know I tried, and got cross-eyed from trying!). [img]smilies/eek.gif[/img]
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