Tauruses, also known as Bull Knights, are recurring enemies in the Legend of Zelda series. They are bull-like creatures with horned heads and glowing white eyes. Tauruses wear armor, either blue or red.
Blue Tauruses wield spears with strange spherical objects on the end, and can be found spread all over the Dark World. Encounters with Red Tauruses, wielding pitchforks, occur less frequently; only one Red Taurus can be found outside Ganon's Tower. Tauruses are the Dark World equivalent of Hyrule Guards, and behave in the exact same manner; the only difference being their appearance and the weapons they wield. Despite not carrying a visible shield, they can block Link's attacks from the front, presumably with their weapons.
Tauruses act the same way they did in A Link to the Past. The red variety is much more common, but deals more damage and takes more hits than the blue variety.
Taurus is Latin for the English word "bull". Since Tauruses are bull-like in appearance, this is a possible derivative of the name.