X-ray of the Smithsonian's two-headed shark and other specimens

sharktwo The National Museum of Natural History's Sandra Raredon maintains the "fish library," a job that includes X-raying the specimens like this two-headed smooth-hound shark. Below, a small tooth sawfish and Atlantic angel shark.

"A Two-Headed Shark and Other X-Rayed Beauties at the Smithsonian"

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