18. Sea Pig
Location: Found in all the world’s oceans
These animals, known as sea pigs, are in fact a type of sea cucumber. Sea pigs are found in the deepest abyssal depths of the world’s oceans, as far as 3.7 miles under the ocean surface. They are known to eat bits of decaying plant and animal material found in deep sea mud, but are awfully fond of food that has recently fallen from the ocean’s surface, like a whale corpse!