A walk through a Costa Rica Monteverde cloud forest reveals a lush green garden of mosses, ferns, flowers and epiphytes growing thickly on every tree. Clouds drift in and settle among the slopes, giving the continuous moisture required for such exuberant plant growth. Dangling roots and vines sweep across the trails. The air is rich with the sounds of birds and the occasional scurrying of small mammals on the forest floor. In the distance a howler monkey roars.