Ankylosaurs were a group of armored dinosaurs that lived during the Late Jurassic to the Late Cretaceous periods. They are known for their distinctive body armor, which included bony plates and spikes that provided protection against predators. These herbivorous dinosaurs walked on four legs and had a low, heavy build. One of the most famous ankylosaurs is Ankylosaurus, which had a club-like tail that could be used as a weapon. Ankylosaurs primarily fed on low-lying plants and were well-adapted to their environments, making them successful herbivores during their time on Earth.