Chapter 8, Flies and Spiders

From the text:

The nights were the worst. It then became pitch-dark - not what you call pitch-dark, but really pitch; so black that you really could see nothing. Bilbo tried flapping his hand in front of his nose, but he could not see it at all. Well, perhaps it is not true to say that they could see nothing: they could see eyes. They slept all closely huddled together, and took it in turns to watch; and when it was Bilbo's turn he would see gleams in the darkness round them, and sometimes pairs of yellow or red or green eyes would stare at him from a little distance, and then slowly fade and disappear and slowly shine out again in another place. And sometimes they would gleam down from the branches just above him; and that was most terrifying. But the eyes that he liked the least were horrible pale bulbous sort of eyes. "Insect eyes" he thought, "not animal eyes, only they are much too big."