Elkinmtcwb, I was not in any way implying youd be shooting your nilgai out of a truck. I was only stating that nilgai are not known asbeing veryhard to hunt.They were released in portions of south Texas in the Kingville/Padre area as a replacement for cattle, if that tells you anything. They are stupid animals. My freind has a ranch near South Padre Island, and they are everywhere, on free ranging land. We were just screwing around on his ranch during the spring and we had no trouble getting within50 yards of them without any camo. They pretty much travel in herds so that makes it slightly more challenging.It should not be difficult for you to get one. As of the moment I am not sure of anyone who makes nilgai calls so you may be out of luck...Your best bet is spot and stalk whether or not they are in rut or not. By the way i have never heard any the park you are talking about but a quick search on google turned up a few results. Texas is not known for its public land hunting..... but goog luck to you.