Sea pigs (Scotoplanes globosa) are a deep sea-dwelling species of sea cucumber. They have several squatty little legs and a giant mouth with which they eat detritus that drops down from the ocean surface. Scotoplanes sea pigs (sometimes other species that look similar are called sea pig) live in the deepest abyss, up to 3.7 miles under the ocean surface. In contrast, the deepest part of the Grand Canyon is only 1.1 miles down! And though scientists know very little about their ecology and behavior, since it's a bit difficult to study creatures living that far down, they often find them hanging about in great numbers… (read more: Animal Planet)