All of the remaining sauropods, such as Saltasaurus, Alamosaurus, and Argentinosaurus, were plant eaters. The most numerous and diverse herbivores in the Cretaceous, however, were the ornithischians, including the duck-billed ornithopods, the horned ceratopsians, the thick-headed pachycephalosaurs, and the armored ankylosaurs. The major carnivorous dinosaurs of the Cretaceous period were from the saurischian (lizard-hipped) groups, and were theropods. They included the large carnosaurs such as Giganotosaurus, Carcharodonotosaurus, and Tyrannosaurus, as well as the smaller, more agile dromaeosaurs, such as Velociraptor, Deinonychus, and Utahraptor. The list is huge, and more fossils of animals are found and added to the list each year.