What is the name of an African Antelope that ends in udu?

Antelope, caribou, chamois, chevrotain, dik-dik, elk, gazelle, gnu, impala, okapi, springbok, Thomson's gazelle- most likely gnu; a large antelope with a head resembling that of an ox, a short mane, a beard, downward curving horns, and a tufted tail. Native to Africa.