Epiphytic Orchid Hybrids:  All the non-terrestrial orchids at the zoo are epiphytic and have been positioned on trees to grow as they would in their native habitat.  Since orchid species readily hybridize, orchid growers have created a very large number of hybrids, many inter-generic.  The orchids present belong to several families that have been raised artificially then fastened to the trees to establish themselves.