SAN SEBASTIAN, Canary Islands - Juan Cabello takes pride in not using a cell phone or the Internet to communicate. Instead, he puckers up and whistles. Cabello is a "silbador," until recently a dying breed on tiny, mountainous La Gomera, one of Spain's Canary Islands off West Africa. Like his father and grandfather before him, Cabello, 50, knows "Silbo Gomero," a language that's whistled, not spoken, and can be heard more than two miles away. This chirpy brand of chatter is thought to have come over with early African settlers 2,500 years ago. Now, educators are working hard to save...