The RGV is without a doubt the best place to go herping in South Texas. The RGV is defined in this list as including the counties of: Hidalgo, Cameron, Willacy, Starr and Zapata. Species included range in difficulty, certain species are incredibly difficult to locate, with only a few museum or historical records on file. All species in this list have been verified to have been recorded in the lower RGV more than once.