More than 65 years ago, William Beebe (1917) wrote, “Yet another continent of life remains to be discovered, not upon earth, but one to two hundred feet above it…At present we know almost nothing of it. Up to now gravitation and tree-trunks swarming with terrible ants have kept us at bay, and of the tree-top life we have obtained only unconnected facts and specimens.“ Nothing much has changed in the last six decades to improve our knowledge of tropical forest canopies, the last biotic frontier. In addition, we are now faced with the projected loss of most of the tropical forest within the next 25 years at a rate of 7 to 12 million ha per year (U.S. National Research Council 1980).