The cookie cutter shark (Isistius brasiliensis) is as fearless as they come! This small, 20-inch shark can take on giants like whales and larger sharks, and have even been known to mistakenly try to bite submarines. They dwell in the deep warm ocean and come closer to the surface as the sun sets to grab a quick snack off their unsuspecting prey. Cookie cutter sharks approach their victims from below, latch on with their suction cup style lips, bite and then twist (below). A nice, round hole is left as a souvenir. They get this easy meal by tricking other ocean residents with their distinctive brown collar, which may act as a lure that allows the cookie cutter shark to be seen as a smaller, not-so-scary fish. As frightening as they seem, the ...

It turns out, those infamous teeth are in fact razor-sharp modified placoid scales. Doesn't quite have the same ring to it.

Female lemon sharks return to the place they were born almost 15 years later to give birth to their own young, a longer-term study has revealed, confirming "homing" behaviour for the first time in sharks.

A new estimate suggests 100 million sharks are slaughtered worldwide every year, numbers that are completely unsustainable according to researchers.

The majority of the time, the fin is the only part of the body used. The rest is simply thrown away.