Check this out if you haven't already. This is just the cutest thing. Dr. Phil Currie kicks off 2016 with a description of a near-complete baby Chasmosaurus!
I remember Chasmosaurus with a lot of nostalgia. It was my favorite horned dinosaur growing up. In fact it was my second favorite dinosaur of any sort for a long time (after Giraffatitan of course, which was then known as "Brachiosaurus brancai"). The different species and horn configurations fascinated me no less than the endless variations in modern antelope horns, from the little nubs on C. belli to the longer studs on C. russelli, to the impressive upturned skewers of C. kaiseni (or Mojoceratops, if the two skulls are truly from the same species). The frill was large but simple, a rectangular shield framed with rows of basic epoccipital studs and a couple of pairs of larger studs at the corners. This genus was the namesake of its own subfamily, the classic "standard model" three-horned dinosaur by which all others were measured, most of which appear like some fancier variation of it. More of the "three-horns" in fact resemble Chasmosaurus than they do Triceratops. But there was never a baby specimen... until now.
The strangest thing about this adorable dinosaur is how long the hindlimbs are compared to the body, particularly when you scale it up against an adult's proportions. While the arms are missing, there's a possibility that they were not unusually elongated relative to the adult proportions, which begs the question - were baby ceratopsids bipedal? This was after all the basal ceratopsian condition found in Leptoceratops and other protoceratopsids. There's already been some venturing (and illustration) of the theory of habitually bipedal running among baby sauropods, which makes a lot of sense (for the bottom-heavy diplodocids anyway - I don't really see Toni the Brachiosaurus doing too much of this). But there haven't been a lot of juvenile ceratopsid remains complete enough to do a biometric analysis of bipedal running and its feasibility. What do you think? (BTW the paper is free to download, though being in the control of JVP's new masters Taylor and Francis, it's uncertain how long that will last. Get it while you can!)