October 16, 2018 - Can you see the sea slug hidden in this grape-like algae? For decades, these camouflaged creatures were thought to be one species. But a new study shows that these sea slugs are more diverse than previously thought. There are actually five species, not just one! Each species has unique teeth, which seem honed to pierce different kinds of sea grapes. Finding a new species is difficult, but finding a new species that's a master of disguise is even harder.