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Thescelosaurus is a genus of small ornithopod dinosaur known from Upper Cretaceous rocks of western North America. It belonged to the last dinosaurian fauna of North America before the Cretaceous–Paleogene extinction event at approximately 66 million years ago, living alongside dinosaurs such as Tyrannosaurus and Triceratops. This common genus was described from a specimen discovered in 1891, but not unpacked and studied until the 1910s. These circumstances suggested the names of the genus and type species T. neglectus, which roughly translate to "godlike, wondrous, or marvelous neglected lizard". Thescelosaurus is best known from several partial skeletons representing three species: T. neglectus, T. assiniboiensis, and T. garbanii. One specimen unearthed in 1993 was initially thought to include a preserved heart, but later study found the object is probably a concretion. Thescelosaurus was a bipedal animal with a relatively long pointed skull and robust limbs. Typical individuals measured on the order of 2.5 to 4.0 m long. It was probably primarily herbivorous and may have preferred to live near streams. (see more...)