TED-Ed Lesson: The species of slug known as Elysia chlorotica may not look like much— it resembles a bright green leaf— but it’s one of the most extraordinary creatures on our planet. Living in marshes along the coast of North America, it can go about a year without eating. During that time, it lives like a plant. How is this possible? Luka Seamus Wright digs into the incredible adaptations of these mixotrophs.