Tux, the Linux mascot, is a penguin, but have you ever wondered why it’s a penguin? The answer depends on who you ask: Linus recounts a story in which he was bitten by an angry penguin, infecting him with a (made-up) disease called “penguinitis”. Others say its selection was due to Linus’ fondness for the animal and/or its unsuitability as a corporate logo.