In November 2011, a camera trap recorded one of the most spectacular immigrants ever.
Deep in the Santa Rita mountains of Arizona, a single male jaguar padded in front of the camera. It was incredible: no wild jaguars had been seen in the United States since 1986.
Adult male jaguars can weigh up to 200 pounds, and the cat quickly earned an equally weighty nickname: "El Jefe," Spanish for "the boss." The boss wouldn't be alone for long. Over the next few years, a handful of other jaguars also appeared, including one as recently as November 2016.