The only known wild jaguar in the United States is seen roaming around a creek and other parts of a mountain range in southern Arizona in the first publicly released video of the giant cat. "El Jefe" -- Spanish for "the boss" -- has been living in the Santa Rita Mountains about 25 miles south of downtown Tucson for over three years, according to the Center for Biological Diversity. El Jefe is about 7 years old and is one of only four or five jaguars that have been spotted in the U.S. in the last 20 years. He's the only...