Ankylosaurs were a group of armored dinosaurs that lived during the Late Cretaceous period. They are known for their distinctive body structure, which included a heavily armored back covered in bony plates and spikes. Their most famous feature was the club-like tail, which they likely used for defense against predators. These dinosaurs were herbivores, primarily feeding on low-lying plants. Ankylosaurs walked on four sturdy legs and had a low, wide body, which helped them support their heavy armor. Fossils of ankylosaurs have been found in various parts of the world, providing valuable insights into their behavior and environment during the time of the dinosaurs.