According to some estimates, tourists spend more than 165 billion dollars a year on activities observing wildlife. Take Stingray City in the Cayman Islands, for example. There, painter and conservationist Guy Harvey approximates that a single ray can bring in up to $10,000,000 over the course of its lifetime. But what impact is tourism having on the stingrays themselves? For one thing, they’ve ditched a nocturnal lifestyle. University of Rhode Island researcher Brad Wetherbee joins Worldview to explain how tourism is affecting Stingray behavior at Stingray City. (Photo: AP Images).