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The parasite Giardia was thought to represent a throwback to the earliest days of advanced cellular life. But biologists are now arguing over its true status. Jonathan Knight reports. Intestinal cramps rarely inspire deep thoughts about evolution. But anyone who has suffered an infection of the gut parasite Giardia intestinalis can boast of having an intimate, if painful, familiarity with an icon of evolutionary theory.

Not so special, after all?