Tauren

The Tauren are a bovine race native to the obscure world of Azeroth. They are a physically imposing race of warriors, possessing an anthropomorphic bovine genotype with super-human stamina, overpowered racial combat abilities, and bizarrely well-developed horticultural skills.

Most Tauren derive satisfaction with their agrarian culture and primitive existence. However, the Terran Confederacy was able to lure away large numbers of young bulls for a life of adventure and violence along the galactic rim, inducting them as Tauren Marines.

Note that this information is derived from an April Fool's joke by Blizzard Entertainment and as such, should not be taken as canon.

Trivia
The Tauren are taken directly from the race of Tauren in StarCraft's counterpart universe of Warcraft.