Argenankylus

Argenankylus is an extinct species of Ankylosaurid that lived in what is now Argentina during the Late Cretaceous from 70.5 million years ago to 66 million years ago. They were most likely herbivorous like most other Ankylosaurid species, but may have been omnivorous as some fossils suggests, feeding on bones to get into bone marrow and feeding on carrion of other large animals. Depending on a species, they were either about the size of Euoplocephalus or Ankylosaurus of Late Cretaceous North America. Also depending on a species, they either had spikes jutting out of their sides or not, for larger species, they didn't due to their larger sizes, meaning they didn't have as much predatora, for smaller species, they did due to predation, so by having spikes jutting out their sides, smaller Argenankylus species was well protected. It is unknown why Argenankylus had suddenly became extinct.