Silesaurus opolensis was an dinosauriform archosaur that lived in Europe during the Late Triassic Period around 220 million years ago. An insect-eater with a body length of around seven and a half feet, Silesaurus has been traditionally considered a member of a sister lineage to dinosaurs proper, but some recent paleontological analyses suggest that it may be a true dinosaur at the base of the ornithischian lineage (the grouping of dinosaurs that includes the duck-billed hadrosaurs, the armored stegosaurs and ankylosaurs, and the horn-faced ceratopsians). Like the ornithischians, Silesaurus appears to have had a beak covering the tip of its lower jaw (or predentary).