Blue wildebeest is placed in the family Bovidae, ruminant animals with cloven hooves. The generic name "Connochaetes" derives from the Greek words κόννος, kónnos, "beard", and χαίτη, khaítē, "flowing hair", "mane". The specific name "taurinus" originates from the Greek word "tauros", which means a bull or bullock. The common name "blue wildebeest" refers to the conspicuous, silvery-blue sheen of the coat, while the alternative name "gnu" originates from the name for these animals used by the Khokloi people, a native pastoralist people of southwestern Africa. Though the blue and black wildebeest are currently classified in the same genus, the latter was previously
Blue wildebeest Cradle of Humankind in the past. Apart from eastern Africa, fossils are commonly found in Elandsfontein, Cornelia, and Florisbad. The blue wildebeest exhibits sexual dimorphism, with males being larger and darker than females. The blue wildebeest is typically in head-and-body length. The average height of the species is . While males weigh up to , females seldom exceed . A characteristic feature is the long, black tail, which is around in length. All features and markings of this species are bilaterally symmetrical for both sexes. The average life span is 20 years in the wild, and 21 years in captivity.