19. The Gummy Squirrel (Psychropotes longicauda)
The Gummy Squirrel is a peculiar sea cucumber, instantly recognizable by its gelatinous body and unusually elongated, tail-like appendage. Recent submersible missions have spotted this strange creature at greater depths than ever before, further revealing the vast diversity of deep-sea life. Its soft, flexible body allows it to thrive in the extreme pressure of the abyss. For more on this delightfully odd animal, see The Atlantic.