Until recently, Sehuencas water frogs were among the more than 500 species of frogs and other amphibians on the brink of extinction. Just one male, named Romeo, was living in a lab in Bolivia, assumed to be the last of his species. But researchers recently found five more of these frogs in a cloud forest in the mountains of Bolivia. They took one of the females, named her Juliet, and brought her to meet Romeo.