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The Rio Grande Delta of Texas is one of the most diverse ecological areas in Texas. The area is favorite among ornithologists due to the presence of many species that winter there or migrate through the area. Similarly, the Delta harbors several rare mammals, reptiles, amphibians, and a host of invertebrates, which are found nowhere else in North America. Most ecologists attribute this unique faunal diversity to the great variety of vegetation that characterizes the Rio Grande Delta. Accurately identifying the vegetation is therefore an important aspect of field research performed in the region.