Tropical Fish: The Thorn-Tailed Fish (Acanthuridae) is a family of forked-tailed fish, (aka: tang, surgeonfish, unicornfish & more). There are over 80 species in this family, all who have very sharp & dangerous spines on their tail, which fork out at their rear. Usually the spines lie flat against the sides of the fish but if they are angry or scared the spines stick out & can be used to lash out at any perceived threat as the fish thrashes its tail about.
This is awesome... until I start thinking about what it will look like when people start helping themselves to the flatware. It won't take too many utensils removed before it no longer looks like a work of art, and more like spilled silverware.