Amazon fish wears nature's 'bullet-proof vest' to thwart piranhas

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Amazon fish wears nature's 'bullet-proof vest' to thwart piranhasOne of the world’s largest freshwater fish is protected by the natural equivalent of a “bullet-proof vest,” helping it thrive in the dangerous waters of the Amazon River basin with flexible armor-like scales able to withstand ferocious piranha attacks. Researchers from the University of California, San Diego and University of California, Berkeley on Wednesday described the unique structure and impressive properties of the dermal armor of the fish, called Arapaima gigas.