holotype, a small, articulated and almost complete skeleton from the Frenchman Formation (late Maastrichtian stage) of Saskatchewan. In April 2022, it was reported that a specimen of Thescelosaurus was found at the Tanis fossil site, supposedly dating to the exact day of the K-Pg extinction, making it the first non-avian dinosaur fossil recovered from that date. Description Overall, the skeletal anatomy of this genus is well documented, and restorations have been published in several papers, including skeletal restorations and models. The skeleton is known well enough that a detailed reconstruction of the hip and hindlimb muscles has been made. The animal's size has been estimated in the 2.5–4.0 m range for length (8.2–13.1 ft) for various specimens, and a weight of 200–300 kilograms (450–660 pounds), with the large type specimen of T. garbanii estimated at 4–4.5 meters (13.1–14.8 feet) long. As discussed more fully under "Discovery, history, and species", it may have been sexually dimorphic, with one sex larger than the other. Juvenile remains are known from several locations, mostly based on teeth. Thescelosaurus was a heavily built bipedal animal, probably herbivorous, but potentially not. There was a prominent ridge along the length of both maxillae (the tooth-bearing "cheek" bones), and a ridge on both dentaries (tooth-bearing bone of the lower jaw). The ridges and position of the teeth, deeply internal to the outside surface of the skull, are interpreted as evidence for muscular cheeks. Aside from the long narrow beak, the skull also had teeth in the premaxilla, or upper beak (a primitive trait among neornithischians). Long rod-like bones called palpebrals were present over the eyes, giving the animal heavy bony eyebrows. Its teeth were of two types: small pointed premaxillary teeth, and leaf-shaped cheek teeth. Six small teeth were present in both premaxillae, with a toothless section at the tip of the beak. Thescelosaurs had short, broad, five-fingered hands, four-toed feet with hoof-like toe tips, and a long tail braced by ossified tendons from the middle to the tip, which would have reduced the flexibility of the tail. The rib cage was broad, giving it a wide back, and the limbs were robust. The animals may have been able to move on all fours, given its fairly long arms and wide hands, but this idea has not been widely discussed in the scientific literature, although it does appear in popular works. Charles M. Sternberg reconstructed it with the