Now in its 4th edition, this excellent site guide is published by the American Birding Association (ABA). Written by four birders with great experience of Texas and its birds, the book contains just about all the information any birder will need to embark on a "do-it-yourself" birding trip to the area. Numerous maps, detailed site information, notes on speciality birds, lists, campground addresses, and all kinds of advice and tips. A Birder's Guide To The Rio Grande Valley of Texas will get you to the best spots and maximise the number of birds you will see. It is available direct from the ABA and from most on-line wildlife and bird book sellers.