Johnny Darter (Etheostoma nigrum)
With a name like Johnny Darter, it's no surprise that this fish loves to live where the water's fast and things are moving. But hold on. Despite its mob-esque name and tattoo-like markings, this fish is rather shy. When in its preferred habitat of clean and rocky-bottomed water, johnny orients itself on the bottom with its head facing into the current, not unlike a dog sticking its head out the window. Sometimes, you'll also find it on the underside of flat rocks and off beaches, living the easy life. Eating waterfleas and invertebrate larvae and being eaten by larger predatory fish, johnny, the most common darter in Minnesota, doesn't seem to have a problem dealing with matters of invasive species or the like; no one messes with the mob — almost no one.