From - BBC News By Marta Vidal, ( Features correspondent) Edited by - Amal Udawatta Izabela Cardoso and Fernando Teixeira The tauros is a specially bred version of the auroch, an extinct cattle species (Credit: Izabela Cardoso and Fernando Teixeira) The tauros, a specially bred version of the long-extinct auroch cattle, is being introduced to Portugal's Côa Valley. On a cold, misty morning, a herd of dun-coloured Sorraia horses, an endangered local breed, graze on grass and small shrubs, their short and stocky bodies enveloped in the mist by the Côa river in the mountains of northeastern Portugal. As the sun rises and the mist starts to dissipate, it unveils the deep gorges of the Côa Valley, where vultures and eagles nest on the cliffs. Further south, a herd of large black and chestnut cattle with long horns run with agility. Known as tauros, these bovines are a specially bred version of the long-extinct auroch, the wild ancestor of the modern cow. The horses and tauros were