Okay, so it's not a dinosaur...but instead of ending the episode, we're going to tell you why! Steve picks over a Dimetrodon, which probably makes it into the dinosaur toy roster because it has the dino look and posture most people tend to think of. Included in today's lesson is the criteria needed to make an organism a synapsid, the type of environment that existed before the Triassic period, and basic anatomy comparisons to dinosaurs.