Of late, several paleontologists have started to wonder whether we've been misidentifying dinosaurs of different ontogenetic stages (i.e., ages) as being different species (most infamously, the suggestion that Triceratops and Torosaurus were the same critter). But how do we tell when a specimen is from an adult, mature dinosaur? In this new paper, Hone, Farke & Wedel tackle just this question, and draw some possibly troubling conclusions about how paleontologists determine and define ontogenetic stages...