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Not all wildebeest are migratory. Black wildebeest herds are often nomadic or may have a regular home range of 1 km2 (0.39 sq mi). Bulls may occupy territories, usually about 100 to 400 m (300 to 1,300 ft) apart, but this spacing varies according to the quality of the habitat. In favourable conditions, they may be as close as 9 m (30 ft), or they may be as far apart as 1,600 m (5,200 ft) in poor habitat. Female herds have home ranges of about 250 acres (100 ha; 0.39 sq mi) in size. Herds of nonterritorial bachelor males roam at will and do not seem to have any restrictions on where they wander.

Major predators that feed on wildebeest include the lion, hyena, African wild dog, cheetah, leopard, and crocodile, which seem to favour the wildebeest over other prey. Wildebeest, however, are very strong, and can inflict considerable injury even to a lion. Wildebeest have a maximum running speed of around 80 km/h (50 mph). The primary defensive tactic is herding, where the young animals are protected by the older, larger ones, while the herd runs as a group. Typically, the predators attempt to isolate a young or ill animal and attack without having to worry about the herd. Wildebeest have developed additional sophisticated cooperative behaviours, such as animals taking turns sleeping while others stand guard against a night attack by invading predators. Wildebeest migrations are closely followed by vultures, as wildebeest carcasses are an important source of food for these scavengers. The vultures consume about 70% of the wildebeest carcasses available. Decreases in the number of migrating wildebeest have also had a negative effect on the vultures. In the Serengeti ecosystem, Tanzania, wildebeest may help facilitate the migration of other, smaller-bodied grazers, such as Thomson’s gazelles (Eudorcas thomsonii), which eat the new-growth grasses stimulated by wildebeest foraging.

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