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| | The Lower Rio Grande Valley Biological Profile |
 | | he Rio Grande, born in the high Rockies in southwestern Colorado, meanders more than 1,800 miles across Colorado, New Mexico and Texas before spreading into a grand delta along the Texas/Mexico border. |
 | | Many of the LRGV's odonates exhibit tropical affinities and are widespread in Mexico; thus, the Lower LRGV's odonate fauna presents, along with the its plants, butterflies, birds, and other biotic elements, a distinctly tropical aspect. |
 | | Comparatively few species are outlying representatives of northern groups; indeed, many species widespread in the nearby Hill Country are absent from the Lower Valley. |
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