Cute little sea sheep called Costasiella kuroshimae is a sea slug that loves to eat algae and use the chloroplasts from their food to manufacture their own energy in a process called kleptoplasty. This process, which otherwise can only be performed by single-celled organisms, essentially makes them solar-powered slugs! And they can survive up to a few months on the energy produced by themselves. 

These little creatures have been found everywhere from Japan to Indonesia and the Philippines and can grow up to 5 millimeters in length. Yes, it is the loveliest slug in the ocean.