Jack and Anna Childs went hunting for the elusive Southwestern jaguar, but what they found was bigger than the rare spotted cat, and even more surprising.

Founders of the Borderlands Jaguar Detection Project, the Childs set up “camera traps,” or remote-sensor cameras activated by motion and body heat, along the U.S.-Mexico border. They did capture the jaguar in their cameras.

But they also managed to photograph animal behavior across the entire ecosystem, including some intriguing images of humans. Producer Luis Carrion reports about the life-changing encounter in 1976 with the now famous Macho-B, and the Child’s mission to educate the public about conservation efforts.