A shark's bite may kill prey, but it's the teeth covering its body that make the fish such a good hunter, new research suggests. Sharks are covered in flexible scales—nearly invisible to the human eye—that are made of the same material as teeth. The scaly hide serves as both a suit of armor and a means of streamlining movement, according to Amy Lang, an aerospace engineer at the University of Alabama. For instance, previous research had suggested that a shark can "bristle". (source: news.nationalgeographic.com)
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