To look at the Tully monster, it’s reasonable to say that it’s reminiscent of a slug. At its mid-body, what are believed to be eyes protrude outward on two stalks, like those of a slug. However, in the place where one might assume the mouth would be located is a long, thin appendage with a claw at its end. This claw appears to have teeth. In 2016, a group of scientists conducted a study and said the Tully monster had finally been classified. Their evidence suggested that it was, in fact, a vertebrate. The study focused on prominent features in...