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A tiny tree frog that sings you to bed every night in Puerto Rico. What would we do without you? Imagine the forest suddenly becomers hushed except for the two-tone chrip of the tiny tree frogs called coqui and the twitter of birdsong. A panapoly of giant ferns, banana trees and royal palms fan out overheaed, amount some 240 native tree specieis fed by the 100 billion gallons of rainwater that fall here each year. Streams of crystal-clear water... what a treat. El Yunque: Also, known as the Caribbean National Rain Forest -- The only tropical forest in the U.S. national forest system.