I know Bilbo exaggerated a lot, but didn't the spiders of Mirkwood talk and listen, they were quite intellegent. And Shelob may not have actually ever spoken to us, but she didn't have vocal cords, so it may not have been as easy as gurgling. Plus, I think maybe since she always has time to play with her victims, she may have just watched Gollum beg and let him do it. And she definitely understood languages.
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"I come from yonder...Have you seen Baggins? Baggins has left, he is coming. He is not far away. I wish to find him. If he passes will you tell me? I will come back with gold." - Khamul the Easterling
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