"The brilliant green sea slug Elysia chloroctica doesn't just look like the leaf of a plant: It functions like one, too. When it's supper time, the slug uses chloroplasts taken from local algae to photosynthesize for itself. That's not news: Scientists have known about the chloroplast theft since the 1970s. But it turns out that the slug takes more than just the sunlight-processing chloroplasts. It also steals the algae genes it needs to maintain those food-factories long after the crime is committed." - rønin