I once read an article in a magazine about this location that discussed how important it can be for a wildlife photographer to have a wide diversity of subjects and how South Texas could feed that need. I couldn’t agree more.
I used to live in Texas and while I lived there, I made sure I visited the southern part of the state at least annually. So when the NANPA summit was held in McAllen in 2011, I jumped on the chance to photograph in the region again. Most of the images in the accompanying slide show, are from that trip.
There are two methods to photograph in the area. Visit the local National Wildlife Refuges or book some time with some private landowners with the Valley Land Fund. I suggest you plan your trip such that you have time for both. The wildlife refuges seem more wild and the ranches will usually make for better images. Use them both.