Huh. I thought only people did this:
An article published Wednesday by Britain's Royal Society says that male guppies prefer to associate with their drab-colored counterparts when females are around.
"Males actively choose the social context that maximizes their relative attractiveness," the article said. Or, as lead author Clelia Gasparini put it, "If you are surrounded by ugly friends, you look better."
Works out the same way by making you look smarter when you hang around with stupid people, too. No, no, don't you dare say what you're thinking out loud.