The island of Fiji launched a country-wide initiative to directly involve tourists in sustainability projects.

How is this possible? With their bright green scales and powder blue and white splotches, Fijian iguanas look right at home on the lush, tropical islands of Fiji, for which they are named.

Iguanas inhabit tropical, subtropical and desert regions of the Americas—but surprisingly, they’re also found on a few incredibly remote Pacific islands, such as Fiji. Exactly how iguanas ...