Don't forget the spiders of Mirkwood too. Its a nasty habit of spiders that they tend to eat their husbands, create hundreds of offspring and have far too many legs for their own good.
I'd imagine that the Mirkwood spiders were somehow related to Ungoliant as they could understand speech, which surely implies some Maiar or whatever input. I expect Shelob had simply eaten any competitors in her area, whereas in the dense forests of Mirkwood it would be difficult for this to happen.
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Rumil of Coedhirion
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