Giant spiders

[Alkanoonion]

You can read more about her, well Ungoliant anyway, in the Silmarillion. Isn't shelob also related to the spiders in Mirkwood from the Hobbit

F.Y.I

Ungoliant first apperas in the Sil chp 8 "of the Darkening of Valinor

"Ungoliant descended from the darkness that lies about Arda, when Melkor first looked down in envy upon the Kingdom of Manwe, and that in the beginning she was one of those that he corrupted to his service. But she had disowned her master, desiring to be mistress of her own lust, taking all things to herself to feed her emptiness;.

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