Silverfish, belong to the insect order Thysanura.
From "Frank Zappa-Drowning in the News Bath", by John Winokur:
Jon Winokur (the editor): "I've read that you're nocturnal."
ZAPPA: "Yes, if left to my own devices I would function exclusively at night and sleep during the day."
Jon Winokur: "What do you have against sunlight?"
ZAPPA: "Aside from the fact that it can be hazardous to your health, which wasn't always the case, I dislike the feeling that you experience during the daytime, when so many of the world's souls are awake, being industrious. It's a bad feeling and I don't want to participate. But at night it's a whole different thing. The people who are awake at night are my kind of people. The animals that are awake at night are the better animals: owls, raccoons, bats, the insects that don't want to show off. The ones with the bright colors have to go out in the daytime to get their money's worth, but the nighttime is natural for the drab, beetle-like, slug-like, monastic kinds of life forms. Superior life forms, like silverfish."
Mike Keneally's "Hat" (1992, Immune Records): "My Immense Superiority Over The Silverfish".