Pachyrhinosaurus Argentinus

Pachyrhinosaurus Argentinus is an extinct species of Ceratopsid (which also includes a modern day Korean goatbird) that lived in what is now Argentina during the Late Cretaceous from 71 million years ago to 66 million years ago, making it the last ever Centrosaurines (which also included Centrosaurus, [most species of] Styracosaurus, Einiosaurus, etc, which were already extinct before 70 million years ago). They were most likely herbivorous, feeding on wide variety of plant matter. They were about the size of a Triceratops of North America, so with the defenses that most other Pachyrhinosaurus species (which were found mostly in North America), they were largely protected against most kinds of predators except Giganotocarnotaurus. Their fossils were found together with other Pachyrhinosaurus Argentinus skeletons, suggesting that they may have lived in large herds comparable to that of a modern wildebeest, which would make Pachyrhinosaurus Argentinus herds the biggest cluster of large land animals on Earth, but it may have instead have been predators such as Giganotocarnotaurus dragging lots of Pachyrhinosaurus Argentinus skeletons all the way to their homes to feed on as the teeth impressions suggests. It is unknown why the Pachrhinosaurus Argentinus had suddenly became extinct.