Moray Eel
They’re called the “gangsters of the reef”, and you know why? I’ll tell you why. Not only are they aggressive to all around them, they have a vice-tight grip that they themselves can’t release. If that wasn’t enough, in death too, their mouths need to be pried open manually. Divers have reported being attacked without provocation, and one diver even lost his thumb to a moray eel.
Salt-Water Crocodile
Not many people know this, but crocodiles live in the sea too. I guess it makes sense since most rivers lead to the sea. Australia is a hot-spot for attacks carried out by these beasts. Unlike the reptile whisperer, Steve Irwin, 20-30 people are attacked by salt-water crocodiles every year.