Vogons, from The Hitchhiker's Guide to the GalaxyRead about another entry on the list.
These are the bureaucratic, poetry-writing aliens who demolish the Earth. As Matt Leach notes: "So much paper work just to have intercourse. They would have died out quickly." (Plus, also from Hitchhiker's Guide, the Hoovooloo, a hyper-intelligent shade of blue. Which, yeah, not really that likely.)
The Hitchhiker's Guide To The Galaxy appears on Charlie Jane Anders's lists of eleven books that every aspiring television writer should read and ten satirical novels that could teach you to survive the future, Saci Lloyd's top ten list of political books for teenagers, Rob Reid's list of 6 favorite books, Esther Inglis-Arkell's list of ten of the best bars in science fiction, Don Calame's top ten list of funny teen boy books, and John Mullan's list of ten of the best instances of invisibility in literature.
Also see: Alice-Azania Jarvis's reading list on aliens and John Mullan's list of ten of the best aliens in science fiction.
--Marshal Zeringue