Cookie-cutter sharks are a small species of shark about the size of a domestic cat that will attack predators several times their size, biting off conical chunks of their flesh, and even the soft parts of nuclear submarines.
The cookie-cutter shark (Isistius brasiliensis) was discovered in the early 19th century, by French naturalists, but it wasn’t until the 1970s that marine scientists realized just how brave and dangerous these small marine creatures could be. Up to that point, the conical, deep wounds that researchers often documented on all sorts of marine life, from small fish to dolphins and even great white sharks, were a mystery. It wasn’t until 1971, when Everet Jones discovered small conical pieces of flesh in the stomachs of cookie-cutter sharks that marine scientists began to realize that the deceptively small sharks could severely wound some of the ocean’s mightiest creatures.
