Euoplocephalus, which means "well armored head", is one of the largest and best known of the ankylosaurids. Specimens have been found with almost all their thick plates studded armor in place. Euoplocephalus was closely related to Ankylosaurus. and shared many of the same characteristics. The low-slung body and hips of Euoplocephalus were so broad that it must have been almost round in cross section. The limbs were short round and stocky, and only three toes, tipped with blunt hooves, were present on each hind foot - other ankylosaurus had four toes. The vertebrate at the end of the tail were fused to form a stiffened, rod-like structure that helped to support the large, rounded club at the tip of the tail. The club was formed of four bony plates, help off the ground, and probably used in defence against predators. The base of the tail was almost certainly flexible enough to allow sideways movement, and the tail would have been quite muscular. Euoplocephalus was a herbivore, probably grazing on low vegetation and possibly even digging up roots and tubers. Remains are usually found singly, but the discovery of 22 young Euoplocephalus has raised the possibility that they may have lived in herds.