When it refers to the zodiac sign, the plural of “tauro” is “tauro” or “tauros.” The adjective "tauro" is invariable, which means its form does not change according to the gender or number of the noun it describes.
Que sea tauro no justifica su comportamiento. Es un idiota, reconócelo.Being a Taurus isn't an excuse for his behavior. You have to admit he's just an idiot.
La gitana me leyó la mano y me dijo que un chico tauro me robaría el corazón.The gypsy woman read my palm and told me that a Taurean man would steal my heart.