Brahmins

Brahims are a species of two-headed cow that evolved during the 700-year 'Silence Period' on Earth, which was a period of time when Humanity abandoned the planet after the Fall of Lord Hood. The large levels of radiation on the planet caused many horrific creatures to evolve, like the Deathclaw, the Cazador and the Radscorpions, but the Brahmin are passive creatures who do little more than eat grass. They were spared death by Humanity upon their return, as they were strong and were able to help farmers by pulling larger weights.