Wild Garrano horses have lived in northern Portugal for 20,000 years. "Portugal: Wild Land on the Edge" premieres Wednesday, April 27th at 8/7c on PBS. [VID: The stars of the national park are no newcomers: wild Garrano horses. They have lived among these peaks for 20,000 years. The craggy landscape at 5,000 feet has made them stocky, strong climbers and trusted companions for Portuguese seafarers. Small and surefooted, they were suited to life on the ocean waves. Garranos rarely grow to more th