The spookily named, and looking, goblin shark is one of the ocean’s most unique and mysterious predators (pictured is a preserved specimen). Although they frequent all three oceans, they live so deep – between 800 feet (245m) and 3,000 feet (915m) below the surface – that even basic observations of them are limited. What we do know is that they tend to be fairly mellow creatures, rarely moving at more than a sluggish pace in order to conserve energy in an environment which has freezing temperatures and a sparse amount of high energy food. That said, they are likely to be saving energy for lightning-fast strikes when prey does come along.

30 Incredible Things You Didn't Know About America's Oceans