It's not a sheep (even though we're convincing ourselves it IS because holy crap it's adorable)...it's a Costasiella kuroshimae (or ‘Leaf Sheep’ for short).
This little guy feeds on algae and can be found near Japan, Indonesia and Philippines. They can grow up to 5mm in length and they are one of the only animals in the world that can perform photosynthesis (the others all belong to the sacoglossa sea slug clade). When they eat algae, they suck out the chloroplasts and incorporate them into their own bodies in a process called kleptoplasty. This process, which otherwise can only be performed by single-celled organisms, essentially makes them solar-powered slugs!