Two-headed sharks may sound like a figment of the big screen, but they exist—and more are turning up worldwide, scientists say. A few years ago off Florida, fishermen hauled in a bull shark whose uterus contained a two-headed fetus. In 2008, another fisherman discovered a two-headed blue shark embryo in the Indian Ocean. And a 2011 study described conjoined twins discovered in blue sharks caught in the Gulf of California and northwestern Mexico.
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