This is a Weedy sea dragon, at the Monterey Bay Aquarium. "This astonishing animal defied imagination," a sign reads. "You might never guess it's related to seahorses, with that strange shape and cloak of iridescent colors. How can you tell this fish from its close relative, the Leafy sea dragon? The Weedy sea dragon wears short, stubby fins compared to its more flamboyant cousin."