We’re all aflutter over the sea angel—a mesmerizing deep-sea creature. This swimming snail's rhythmic flapping and graceful movements resemble whimsical wings. The flappy bits you see sculling through the water aren’t wings at all—they’re basically a modified, slimy snail foot. And despite its celestial appearance—the sea angel is a carnivorous hunter. With hidden tentacles tucked away inside its head, it tracks down prey and strikes! | Monterey Bay Aquarium