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
Wildebeest recorded when a dispute between two males occurred. Wildebeest do not form permanent pair bonds and during the mating season, or rut, the males establish temporary territories and try to attract females into them. These small territories are about 3000 m, with up to 300 territories per km. The males defend these territories from other males while competing for females that are coming into oestrus. The males use grunts and distinctive behaviour to entice females into their territories. Wildebeest usually breed at the end of the rainy season when the animals are well fed and at their peak of fitness.