A “buffalo (bison) lizard�? from Late Cretaceous Montana. The name is based on Black Feet Indian eini, “buffalo�? to honor the Black Feet tribe, on whose land in Montana the fossils were found, referring also to the idea that ceratopsians were the “buffalo�? of the Cretaceous, living in large, socially complex herds. Named by paleontologist Scott Matthew Sampson in 1995.